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Acocks, J.P.H. 1953. Veld types of South Africa. Mem. Bot. Surv. South Africa No. 28:1-192.

Adams, C.D. 1997. Caribbean overview. In: WWF and IUCN. Centres of Plant Diversity: A guide and strategy for their conservation, Vol. 3, pp. 233-258. IUCN Publications Unit, Cambridge, UK.

Ahmedullah, M. 1993. "Endemism in the Flora of Peninsular India", PhD Thesis, University of Calcutta.

Akeroyd, J. and Wyse Jackson. P. 1995. A Handbook for Botanic Gardens on the Reintroduction of Plants to the Wild. Botanic Gardens Conservation International, Richmond.

Akeroyd, J., McGough, N. and Wyse Jackson, P. 1994. A CITES Manual for Botanic Gardens. Botanic Gardens Conservation International, Richmond.

Alain, Hno. (A.H. Liogier) 1969. Flora de Cuba. Suplemento. Ed. Sucre, Caracas, Venezuela.

Albers, F. 1983. Cytotaxonomic studies in African Asclepiadaceae. Bothalia 14:795-798.

Albers, F. and Meve, U. 1991. Mixoploidy and cytotypesa study of possible vegetative species differentiation in stapeliads (Asclepiadaceae). Bothalia 21:67-72.

Anderson, E.F. (ed). 1990. Succulent Plant Conservation Studies and Training in Mexico. Stage 1, part 2 - Stage 2, part 2. Unpublished report for WWF-US.

Anderson, E.F., Bonilla F., M., Hoffmann J., A.E. and Taylor, N.P. 1990. Succulent Plant Conservation Studies and Training in Chile. Unpublished report for WWF-US.

Anderson, E.F., Taylor, N.P. and Arias, S. 1994. The Threatened Cacti of Mexico. Royal Botanic Gardens, Kew.

Andrade-Lima, D. 1977. A flora de areas erodidas de calcarlo Bambui, em Born Jesus da Lapa, Bahia. Rev. Brasil. Biol. 37:179-194.

Andrade-Lima, D. 1981. The caatingas dominium. Revta Bras. Bot. 4:149-163.

Antezana Pardo, 0. 1958. Climas de Bolivia. Revta Fac. Agron. 3a. época 342:161-191.

Archer, F. 1993. Integrating conservation practices with pastoralist management strategies in the Richtersveld National Park. Bull. Grassland Soc. Southern Africa 4:31-32.

Areces-Mallea, A. 1992a. Leptocereus santamarinae (Cactaceae), a new species from Cuba. Brittonia 44(l):45-49.

Areces-Mallea, A. 1992b. Pereskia marcanoi, a new species of Cactaceae from Hispaniola. Brittonia 44(4):423-428.

Areces-Mallea, A. 1993a. Leptocereus scopulophilus (Cactaceae), a new species from western Cuba. Brittonia 45(3):226-230.

Areces-Mallea, A. 1993b. Leptocereus carinatus (Cactaceae): una nueva especie de la isla de Cuba. Moscosoa 7:243-248.

Areces-Mallea, A. 1993c. A new species of Melocactus from central Cuba. Phytologia 74( 6):421-427.

Arias, S. 1993. Cactaceas: Conservación y diversidad en Mexico. Rev. Soc. Méx. Hist. Nat. Vol. Esp. (XLIV): 109-115.

Arita, H. and Martinez del Rio, C. 1990. Interacciones flor-murciélago: un enfoque zoocentrico. Instituto de Biologia, Universidad Nacional Autónoma de Mexico.

Arnold, T.H. and De Wet, B.C. 1993. Plants of southern Africa: names and distribution. Mem. Nat. Bot. Surv. South Africa No. 62:1-825.

Axelrod, D. 1979. Age and origin of Sonoran Desert vegetation. Calif. Acad. Sei. Occ. Pap. 132:1-74.

Babu, C.R. 1994. Department of Botany, University of Delhi, in litt.

Bally, P.R.O. 1961. The Genus Monadenium.BenlcW, Berne.

Bally, P.R.O. and Melville, R. 1973. Report on the vegetation of the Somali Democratic Republic with recommendations for its restoration and conservation. Unpublished report.

Bally, P.R.O., Horwood, F.K. and Lavranos, J.J. 1975. A monograph of the genera Pscudolithos and Whitesloanea. Nat. Cactus Sttcc J. (UK) 30(2):31-35.

Barad, G.S. 1989. Just say no. Cactus Succ.J. (US) 61:8788.

Barkhuizen, B.P. 1978. Succulents of Southern Africa. Purnell, Cape Town.

Bayer, M.B. 1982. The new Haworthia handbook. National Botanic Gardens of South Africa, Kirstenbosch, Cape Town.

Benson, L. 1982. The Cacti of the United States and Canada. Stanford University Press, Stanford, CA.

Berger, A. 1930. Crassulaceae. In: Engler, A., Prantl, K. (eds), Die natürlichen Pñanzenfamilien, ed. 2,18a.-Leipzig.

Beyleveld, G.P. 1973. Aalwyne in die tuin. Muller and Retief, Cape Town.

Bloomfield, F. 1985. Miracle plants: Aloe vera. Century Publishing, London.

Boele, C., Kroesen, A.C.J., and Noltee, F.K.A. 1987. Checklist of Brachystelma, Ceropegia, Riocreuxia and the Stapelieae. West Sussex: Southern Reprographics.

Borhidi, A. 1991. Phytogeography and Vegetation Ecology of Cuba. Akademiai Kiado, Budapest.

Bornman, H. and Hardy, D.S. 1971. Aloes of the South African veld. Voortrekkerpers, Johannesburg.

Botanic Gardens Conservation News. 1994. Botanic Gardens Conservation International and the International Association of Botanic Gardens sign of co-operative agreement. Botanic Gardens Conservation News 2:20.

Brako, L. and Zarucchi. 1993. Catalogue of the Flowering Plants and Gymnosperms of Peru / Catálogo de las Angiospermas y Gimnospermas del Peru. Monogr. Syst. Bot. Missouri Bot. Gard. 45.

Bramwell, D. and Z. I. 1974. Wild Flowers of the Canary Islands. Excmo. Cabildo Insular de Tenerife and Stanley Thornes, Ltd., London.

Braun, K. and Prendergast, H.D.V. 1992. Conservation and plant genetic resources in Swaziland. FAO/IBPGR Plant Genetic Resources Newsletter 88/89:43-50.

Braun, K.P. and Dlamini, G.M. 1994. Swaziland's plant diversity and its conservation. In: B.J. Huntley (ed), Botanical Diversity in Southern Africa. Strelitzia 1:117124. National Botanical Institute, Pretoria.

Braun, P.J. and Esteves Pereira, E. 1988. Uebelmannia buiningii Donald - eine bald ausgerottete Art. Kakteen und andere Sukkulenten 39:2ñ3.

Bravo, H. 1978. Las Cactaceas de Mexico, vol. 1 (2nd edn). Universidad Nacional Autónoma de Mexico.

Bravo, H. and Sanchez-Mejorada, H. 1991. Las Cactaceas de Mexico, vols. 2 and 3. Universidad Nacional Autonoma de Mexico.

Brummitt, R.K. and Powell, C.E. 1992. Authors of Plant Names. Royal Botanic Garden, Kew.

Brummitt, R.K. 1992 Vascular plant families and genera. Royal Botanic Gardens, Kew.

Bruyns, P.V. 1983. Resurrection of Quaqua N.E.Brown (Asclepiadaceae-Stapelieae) with a critical review of the species. Bradleya 1:33-78

Bruyns, P.V. 1988. A revision of the genus Echidnopsis Hook.f. (Asclepiadaceae). Bradleya 6:1-48

Bruyns, P.V. 1993. A revision of Hoodia and Lavrania (Asclepiadaceae-Stapelieae). Bot. Jahrb. Syst. 115:145270

Bruyns, P.V., and Forster, P.I. 1991. Recircumscription of the Stapelieae (Asclepiadaceae). Taxon 40:381-391.

Bullock, A.A. 1956. Notes on African Asclepiadaceae. Kew Bull. 6:503-525.

Cabrera, A.L. 1976. Regiones Fitogeograficas Argentinas. In: ACME, Enciclopedia Argentina de Agricultura y Jardinería 2(1).

R.C. 1987. A review of the family Portulacaceae. Aust. J. Bot. 35:383-412.

Carter, S. 1981. Two Euphorbias in danger. Cactus Succ. J. Gr. Br. 43(l):6-8

Carter, S. 1988a. Euphorbieae. In: Polhill, R. M. (ed), Flora of Tropical East Africa, Euphorbiaceae Part 2:409-564.

Carter, S. 1988b. The Euphorbias of Somalia, Part 2. Br. Cactus Succ. J. 6(4):93-95.

Carter, S. 1988c The Euphorbias of Somalia, Part 1. Br. Cactus Succ. J. 6(3):61-64

Center for Plant Conservation. 1991. In: Falk, D.A. and K.E. Holsinger, (eds). Genetics and Conservation of' Rare Plants. Oxford University Press, New York.

CITES/WCMC. 1996. Checklist of CITES Species. CITES/WCMC, Cambridge, UK.

Clausen, R.T. 1959. Sedum of the trans-Mexican volcanic belt. Ithaca, New York.

Clausen, R.T. 1975. Sedum of North America north of the Mexican plateau. Ithaca, New York.

Correll, D.S. and H.B. 1982. Flora of the Bahama Strauss and Cramer, Germany.

Court, D. 1981. Succulent Flora of Southern Africa A.A. Balkema, Cape Town.

Cowling, R.M. 1993. Ecotourism: what is it and what can it mean for conservation? Veld and Flora 79:3-5.

Cowling, R.M. and Hilton-Taylor, C. 1994. Patterns of plant diversity and endemism in southern Africa: an overview. In: B.J. Huntley (ed), Botanical Diversity in Southern Africa. Strelitzia 1:3 1-52. National Botanical Institute, Pretoria.

Cowling, R.M. and Olivier, N.J.J. 1992. Indigenous plants. In: R.F. Fuggle and M.A. Rabie (eds), Environmental Management in South Africa, pp. 212-249. Juta, Cape Town.

Cowling, R.M., Gibbs Russell, G.E., Hoffman, M.T. and Hilton-Taylor, C. 1989. Patterns of plant species diversity in southern Africa. In: B.J. Huntley (cd), Biotic Diversity in Southern Africa: Concepts and Conservation, 19-50. Oxford University Press, Cape Town.

Cremers, G. 1984a. Les euphorbes coralliformcs dc Madagascar. Bull.Jard. Bot. Nat. Belg. 54:23-64.

Cremers, G. 1984b. Les euphorbes geophytes de Madagascar. Bull. Jard. Bot. Nat. Belg. 54:367-39 1.

Cronquist, A. 198 1. The Evolution and Classification of Flowering Plants. Houghton Mifflin, Boston.

Dahlgren, R.M.T. and Clifford, H.T. 1982. The Monocotyledons, a comparative study. Academic Press, London.

Dahlgren, R.M.T., Clifford, H.T. and Yeo, P.F. 1985. The families of the Monocotyledons: Structure, evolution and taxonomy. Springer-Verlag, Berlin.

Davis, S.D., Droop. S.J.M., Gregerson, P., Henson, L., Leon, C.J., Lamlein, Villa-Lobos, J., Synge, H. and Zantovska, J. 1986. Plants in danger. Whut do we know? IUCN, Gland, Switzerland.

De Ferrari G. 1996. In danger: the USA's Endangered Species Act. TRAFFIC Dispatches. May 1996:1,6.

De Klemm, C. 1990. Wild Plant Conservation and the Law. IUCN Environmental Policy and Law Paper No. 24. IUCN, Bonn, Germany.

Dehgan B. and Webster, G. L. 1979. Morphology and infrageneric relationships of the genus Jatroplia (Euphorbiaceae). University of California Publications, Botany 74.

Delanoë, O., Montmollin, B. de, Olivier, L. (comps) 1996. Conservation of Mediterranean Island Plants. 1. Strategy for Action. IUCN/SSC Mediterranean Islands Plant Specialist Group. IUCN, Gland, Switzerland and Cambridge, UK.

Dobat, K. and Peikert-Holle, T. 1985. Bluten und Fledermäuse: 238-243. Senckenbergischen Naturforschenden Gesellschaft.

Donnay, T.J. and Meyer, K. 1991. The distribution and status of the endemic spiral aloe (Aloe polyphylla) in Lesotho. Excelsa 15:29-35.

Drummond, J. 1907. The literature of Furcraea with a synopsis of the known species. Missouri Bot. Card. 18th Ann. Rep, pp. 25-76.

Drummond, R.B., Gelfand, M. and Mavi, S. 1975. Medicinal and other uses of succulents by the Rhodesian African. Excelsa 5:51-56.

Dyer, R.A. 1983. Ceropegia, Brachystelma and Riocreuxia in southern Africa. Balkema, Rotterdam.

Ecker, L. and Burgess, T. 1992. Report on the family Agavaceae. Submitted to the Institute of Museum Services, Washington, DC. On file at Desert Botanical Garden.

Eggli, U. and Taylor, N. (eds) 1994. List of Names of Succulent Plants (other than cacti) from Repertorium Plantarum Succulentarum (1950-1992). The Royal Botanic Gardens, Kew.

Eggli, U. 1994. Sukkulenten. Verlag E. Ulmer, Stuttgart.

Eggli, U., Nyffeler, R., Hart, H.'t. 1994. Consensus classification of the Crassulaceae. In: Hart, H.'t and Eggli, U. (eds), Evolution and systematics of the Crassulaceae. BackuysUitg., Leiden, (in prep.).

Equiarte, L. and Burquez, A. 1988. Reducción en la fecundidad en Manfreda brachystachya (Cav.) Rose, una agavacea polinizada por murciélagos: los riesgos de la especialización en la polinización. Bol. Soc. Bot. Mexico 48:147-149.

Esser, G. 1982. Vegetationsgliederung und Kakteenvegetation von Paraguay. Trop. Subtrop.

Everard, D.A. 1988. Threatened plants of the eastern Cape: a synthesis of collection records. Bothalia 18:271-277.

Falk, D.A. 1992. From conservation biology to conservation practice: strategies for protecting plant diversity. In: P.L. Fiedler and S.K. Jain (eds), Conservation Biology: the Theory and Practice of Nature Conservation, Preservation and Management, pp. 397431. Chapman and Hall, London.

Forster,P.I. and Harold, K. 1989. Secamone R.Br. (Asclepiadaceae): Secamonoideae in Australia. Austrobaileya 3:69-78.

Foster, C. 1993. Aloaceae research collections at RBG Kew. Br. Cactus Succ. J. 11:97-98.

Fourie, J. 1994. Comments on national parks and future relations with neighbouring communities. Koedoe 37:123-136.

Fourie, S. P. 1984-1991. Euphorbias of the Transvaal. In: The Euphorbia J., vols. 2-7.

Fourie, S.P. 1984. Threatened euphorbias in the Transvaal. The Euphorbia J. 2:75-90.

Fourie, S.P. 1986. The Transvaal, South Africa, threatened plants programme. Biol. Consetr. 37:23-42.

Froderstrom, H. 1930-36. The genus Sedum L. 1-4. Acta Hort. Gothob. 5, app. l-75; ibid. 6, app. 1- 111; ibid. 7, app. 1-125; ibid. 10, app. 1-262.

Fuggle, R.F. and Rabie, M.A. (eds) 1992. Environmental Management in South Africa. Juta, Cape Town.

Fuller, D. and Fitzgerald, S. (eds) 1987. Conservation and commerce of cacti and other succulents. TRAFFIC (USA) WWF-US, Washington DC.

Garcia-Mendoza, A. 1987. Monografía del género Beschorneria Kunth, Agavaceae. Tesis Maestria. Facultad de Ciencias, Universidad Nacional Autónoma de Mexico.

Garcia-Mendoza, A. 1989. La familia Agavaccac en el estado de Oaxaca, Mexico. Cactaceas Su cid. Mexicanas 34( 1): 16-22.

Garcia-Mendoza, A. and Bye, R. 1992. Endemic and threatened agaves from central Mexico to northern South America. Paper presented at the 22nd IOS Congress, Desert Botanical Garden, Phoenix, Arizona.

Geesink, R. 1969. An account on the genus Portulaca in Indo-Australia and the Pacific (Portulacaceae). Blumea 17:275-301.

Gentry, H.S. 1972. The Agave Family in Sonora. Agriculture Handbook No. 399. U.S. Department of Agriculture.

Gentry, H.S. 1978. The agaves of Baja California. Occ. Pap. Calif. Acad. Sei. No. 130, San Francisco.

Gentry, H.S. 1982. The Agaves of Continental North America. University of Arizona Press, Tucson.

Gerbaulet, M. 1992a. Die Gattung Anacainpseros L. (Portulacaceae). I. Untersuchungen zur Systematik. Bot. Jahrb. Syst. 113:477-564.

Gerbaulet, M. 1992b. Die Gattung Anacampseros L. (Portulacaceae). III. Untersuchungen zur StandortÖkologie der afrikanischen Arten - Bot. Jahrb. Syst.

Gibbs Russell, G.E. 1985. Analysis of the size and composition of the southern African flora. Bothalia

Gilbert, M.G. 1985. The genus Sedum in Ethiopia. Bradleya 3:48-52.

Gilbert, M.G. 1990. A review of Caralluma R.Br, and its segregates. Bradleya 8: 1-32

Giulietti, A.M. and Pirani, J.R. 1988. Patterns of geographic distribution of some plant species from the Range, Minas Gerais and Bahia, Brazil. In: Heyer, W.R. and Vanzolini, P.E. (eds), Proceedings of a workshop on Neotropical Distribution Patterns, pp. 3960. Academia Brasileira de Ciencias, Rio de Janeiro.

Given, D.R. 1987. What the conservationist requires of ex situ collections. In: D. Bramwell, 0. Hamann, V.

and H. Synge (eds), Botanic Gardens and the World Conservation Strategy. Academic Press, London.

Given, D.R. 1994. Principles and practice of plant conservation. Timber Press, Inc., Portland, Oregon.

Glavovic, P.D. 1993. Flora and the law: a review of existing laws that protect wild plant species in the Republic of South Africa. Flora Conservation Committee, The Botanical Society of South Africa, Kirstenbosch.

Goldblatt, P. 1978. An analysis of the flora of southern Africa: its characteristics, relationships and origins. Ann. Missouri. Bot. Gard. 65:369-436.

Gómez-Campo, C. and collaborators. 1997. Libro Rojo des Especie Vegetales Amenazadas de las Islas Canarias. Vice-consejeria de medio ambiente, Consejeria de Política Territorial.

Good, R. 1974. The Geography of the Flowering Plants, 4th ed. Longmans, London.

Goyder, D.J. 1992. Secamone (Asclepiadaceae subfam. Secamonoideae) in Africa. Kew Bull. 47:437-474.

Grassi, M. (ed) 1982. Simposio sobre conservación de la vegetación natural en la Republica Argentina. Tucuman.

Green, M.J.B., Murray, M.G., Bunting, G.C. and Paine, J.R. 1996. Priorities for biodiversity conservation in the tropics. WCMC Biodiversity Bull. 1.

Greuter W., Bürdet H.M., Long G. 1984. MED-CHECKLIST. Conservatoire et Jardin Botaniques de la Ville de Genève.

Groenewald, B.H. 1941. Die aalwyne van Suid-Afrika, Suidwes-Afrika, Portugees Oos Afrika, Swaziland, Basoetoeland en 'n spesiale ondersoek van die ktassifikasie, chromosome an area le van die Aloe Nasionale Pers, Bloemfontein.

Groombridge, B. (ed) 1992. Global Biodiversity: Status of the Earth's Living Resources. Compiled by the World Conservation Monitoring Centre. Chapman & Hall, London.

Hall, A.V. and Veldhuis, H.A. 1985. South African Red Data Book: Plants - Fynbos and Karoo Biomes. South African Nat. Sei. Programmes Rep. No. 117. CSIR, Pretoria.

Hall, A.V. 1987. Threatened plants in the Fynbos and Karoo Biomes, South Africa. Biol. Conserv. 40:29-52.

Hall, A.V., De Winter, B. De Winter, M., Van Oosterhout, S.A.M. 1980. Threatened plants of southern Africa. South African Nat. Sei. Programmes Rep. No 45, CSIR, Pretoria.

Hall, A.V., De Winter, B. Fourie, S.P. and Arnold, T.H. 1984. Threatened plants in southern Africa. Biol. Conserv. 28:5-20.

Ham, R.C.H.J. van 1994. Phylogenetic implications of chloroplast DNA variation in the Crassulaceae. Ph.D. Thesis, Utrecht.

Hamilton, M.B. 1994. Ex situ conservation of wild plant species: time to reassess the genetic assumptions and implications of seed banks. Conserv. Biol. 81:39-49.

Hargreaves, B.J. 1990. The Succulents of Botswana: an Annotated Checklist. National Museum, Monuments and Art Gallery of Botswana, Gaborone.

Hargreaves, B.J. 1992. The succulent euphorbias of Botswana. The Euphorbia J. 8:45-50.

Hart, H. 't. 1982. The white-flowered European Sedum species. 1. Principles of a phylogenetic classification of the Sedoideae (Crassulaceae) and the position of the white-flowered Sedum species. Proc. Kon. Ned. Akad. Wetensch., ser. C, 85:663-675.

Hart, H. 't. 1991. Evolution and classification of the European Sedum species (Crassulaceae). Flora Meditewanea 1:31-61.

Hart, H. 't. 1994. Intrafamilial classification of the Crassulaceae. In: Hart, H. 't and Eggli, U. (eds), Evolution and systematics of the Crassulaceae. Backuys Uitg., Leiden. (in prep.).

Hartmann, H.E.K. 1981. Ecology, distribution and taxonomy in Mesembryanthemaceae as a basis for conservation decisions. In: Synge, H. (ed), The biological aspects of rare plant conservation. John Wiley and Sons, Chichester.

Hartmann, H.E.K. 1991. Mesembryanthema. Cont. Bol. Herb. 13:75-157.

Hawkes, J.G. 1992. Gene banking strategies for botanic gardens. Opera Botanica 113:15-17.

Henrickson, J. 1969. Introduction to the Fouquieriaceae. Cactus Succ. J. (US) 41:97-105.

Hernandez, H.M. and Barcenas, R.T. 1995. Endangered cacti in the Chihuahuan Desert. I. Distribution Patterns. Conserv. Biol. 9(5): 1176-1188.

Hernandez, H.M. and Godinez, A.H. 1994. Contribución al conocimiento de las cactaceas Mexicanas amenazadas. Acta Bot. Mexicana 26:33-52.

Hernandez, H.M., Alvarado, V., and Ibarra, R. 1993. Base de datos de colecciones de Cactaceas de Norte y Centroamerica. An. Inst. Biol. Univ. Nac. Autdn. Mexico Ser. Bot. 64(2):87-94.

Hernandez, L. 1993. Beaucarnea, un género amenazado? Cactaceas Sucul. Mexicanas 38( 1):11-13.

Hernandez, L. and Simpson, B. 1992. Evidence for the monophyly of Beaucarnea and allies (Nolinaceae). Paper presented at the 22nd IOS Congress, Desert Botanical Garden, Phoenix, Arizona.

Hershkovitz, M. 1991. Phylogenetic assessment and revised circumscription of Cistanthe Spach (Portulacaceae). Ann. Missouri Bot. Card. 78:10091021.

Hershkovitz, M. 1992. Leaf morphology and taxonomic analysis of Cistanthe tweedyi (nee Lewisia tweedyi; Portulacaceae). Syst. Bot. 17:220-238.

Hershkovitz, M. 1993. Revised circumscription and subgeneric taxonomies of Calandrinia and Montlopsls (Portulacaceae) with notes on phylogeny of the portulacaceous alliance. Ann. Missouri Bot. Gard. 80:333-365.

Heywood, V.H. 1992. Botanic gardens and conservation: new perspectives. Opera Botanica 113:9-13.

Hilton-Taylor, C. 1994. Western Cape Domain Succulent Karoo. In: WWF and IUCN. Centres of Plant Diversity: A guide and strategy for their conservation, Vol. 2, pp. 204-217. IUCN Publications Unit, Cambridge, UK.

Hilton-Taylor, C. 1996a. Patterns and characteristics of the flora of the Succulent Karoo Biome, southern Africa. In: L.J.G. van der Maesen et al. (eds), The Biodiversity of African Plants, pp. 58-72. Kluwer Academic Publishers, Dordrecht.

Hilton-Taylor, C. 1996b. Red Data List of Southern African Plants. Strelitzia 4. National Botanical Institute, Pretoria.

Hilton-Taylor, C. 1996c. Red Data List of southern African plants. 1. Corrections and additions. Bothalia 262:177-182.

Hilton-Taylor, C. (ed) (in prep.). Inventory of southern African Threatened Plants.

Hilton-Taylor, C. (in prep.). Southern African Red Data Book: Plants - Succulent and Nama-Karoo Biomes.

Hilton-Taylor, C. and Le Roux, A. 1989. Conservation status of the fynbos and karoo biomes. In: B.J. Huntley (ed), Biotic Diversity in Southern Africa: Concepts and Conservation, pp. 202-223. Oxford University Press, Cape Town.

Hilton-Taylor, C. and Smith, G.F. 1994. The conservation status of Aloaceae in southern Africa. In: B.J. Huntley (ed), Botanical Diversity in Southern Africa. Strelitzia National Botanical Institute, Pretoria.

Hoffmann J., A.E. and Flores, A.R. 1989. The conservation status of Chilean succulent plants: A preliminary assessment. In: Benoit C., I. (ed), Red book on Chilean Terrestrial Flora (Part One) pp. 107121. CONAF, Santiago, Chile.

Hoffmann, A.E. 1989. Cactáceas en la flora silvestre de Chile. Fundación Claudio Gay.

Holmes (Carter), S. 1993. Euphorbia, Monadenium. In: Thulin, M. (ed), Flora of Somalia 1.

Holmgren, P., Holmgren, N. and Barnett, L. 1990. Index Herbariorum. Part 1. The Herbaria of the World. International Association for Plant Taxonomy, The New York Botanical Garden, New York.

Holt-Biddle, D. 1994. An African solution to an African problem. Africa Envir. Wildl. 21:33-35.

Howard, R. A. 1974-1989. Flora of the Lesser Antilles, Vol. 6. Arnold Arb., Harvard University, Cambridge, MA.

Howard, R.A. 1973. The Vegetation of the Antilles. In: A. Graham (ed), Vegetation and Vegetational History of Northern Latin America. Elsevier, Amsterdam.

Howard, R.A. 1977. Conservation and the endangered species of plants in the Caribbean Islands. In: G.T. Prance and T.S. Elias (eds), Extinction is forever. The New York Botanical Garden, Bronx, N.Y.

Howell, D. 1974. Pollinating bats and plant communities. Nat. Geogr. Soc.Res. Rep. 1974 Projects.

Huber, H. 1957. Revision der Gattung Ceropegia. Mem. Soc. Brot. 12:1-203.

Huespe Fatecha, H.M.A., Spinzi Mendoca, L.A., Curie1 de Enciso, M.V. and Heninger, J. 1991. Vegetación y uso de la tierra en la region occidental del Paraguay (Chaco). San Lorenzo.

Hunt, D. L. 1974. The role of generic reserve collections. In: D.R. Hunt (ed), Succulents in Peril, Supplement to IOS Bull. 33.

Hunt, D.R. 1982. The Conservation status of Mexican Mammillarias. Cactus Succ. J. Gr. Br. 44(4):87-88

Hunt, D.R. (comp.) 1992. CITES Cactaceae Checklist. Royal Botanic Gardens, Kew.

Hunt, D.R. and Taylor, N.P. 1990. The genera of Cactaceae: progress towards consensus. Bradleya 8:85107.

Hunt, D.R. and Taylor, N.P. (eds). 1986. The genera of the Cactaceae: towards a new consensus. Bradleya 4:65-78.

Hunt, P.F. 1974. Ecosystem reserves. In: D.R. Hunt (ed), Succulents in Peril, Supplement to IOS Bull. 33.

Huntley, B.J. 1978. Ecosystem conservation in southern Africa. In: M.J.A. Werger (ed), Biogeography and Ecology of Southern Africa, pp. 1333-1384. Junk, The Hague.

Huntley, B.J. (ed) 1989. Biotic Diversity in Southern Africa: Concepts and Conservation. Oxford University Press, Cape Town.

Huntley, B.J. (ed) 1994. Botanical Diversity in Southern Africa. Strelitzia 1. National Botanical Institute, Pretoria.

Huntley, B.J. 1996. Biodiversity conservation in the new South Africa. In: F. di Casta & T. Younes (eds), Biodiversity, Science and Development - Towards a New Partnership. CAB International, Wallingford, UK.

Hutchinson, J. 1934. The Families of Flowering Plants. Monocotyledons. Vol. 2. Oxford University Press.

Hutchinson, J. 1959. The families of flowering plants. Monocotyledons. Vol. 2 (2nd ed). Clarendon Press, Oxford.

Hutchison, R.A. (ed) 1991. Fighting for survival. Insecurity, people and the environment in the Horn of Africa. IUCN, Gland, Switzerland.

Ihlenfeldt, H.-D. 1994. Diversification in an arid world — the Mesembryanthemaceae. Ann. Rev. Ecol. Syst. 25:521-546.

IUCN. 1985. Recommendations passed at "Botanic Gardens and the World Conservation Strategy." IUCN Conservation Monitoring Centre, Kew.

IUCN. 1987. Translocation of living organisms. IUCN/SSC Position Statement, 4 September 1987, Gland, Switzerland.

IUCN. 1994a. Guidelines for protected area management categories. CNPPA with the assistance of WCMC. IUCN, Gland, Switzerland and Cambridge, UK.

IUCN. 1994b. IUCN Red List Categories. IUCN, Gland, Switzerland.

IUCN. 1995. Guidelines for Re-introductions. IUCN/SSC Re-Introduction Specialist Group. IUCN, Gland, Switzerland.

IUCN/SSC Orchid Specialist Group. 1996. Orchids: Status Survey and Conservation Action Plan. IUCN, Gland, Switzerland and Cambridge, UK.

IUCN-BGCS. 1987. International Transfer Format for Botanic Garden Plant Records. ITF, Hunt Institute for Botanical Documentation, Pittsburgh.

IUCN-BGCS. 1989. Botanic Gardens Conservation Strategy. IUCN-BGCS [BGCI], WWF, Kew, UK.

Jacobsen, H. 1960. A Handbook of Succulent Plants (Volumes I to III). Blandford Press, London.

Jacobsen, H. 1974. Lexicon of Succulent Plants. Blandford Press, London.

Jacobsen, H. 1986. A handbook of succulent plants. Vol. I (4th reprint). Blandford Press, Poole, Dorset.

Jankowitz, W.J. 1975. Aloes of South West Africa. Division of Nature Conservation and Tourism, Administration of South West Africa, Windhoek.

Jankowitz, W.J. 1977. The distribution of the genus Aloe in the districts Bethanien, Lüderitz and Warmbad, South West Africa. Madoqua 10:33-53.

Jeffrey, C. 1992. The genus Apodanthera Cucurbitaceae in Bahia state, Brazil. Kew Bull. 47:517-528.

Jenkins, M.D. 1992. The wild plant trade in Europe: results of a survey of European nurseries. TRAFFIC Europe.

Jenkins, M. 1993. The wild plant trade in Europe: results of a TRAFFIC Europe survey of European nurseries. Unpublished report. TRAFFIC Europe.

Jenkins, M.D. 1994. Export trade in Madagascar's plants and animals: consequences for species survival. Submitted to United States Agency for International Development/Madagascar under contract number PCD-1406-1-00-0073-00, by Tropical Research and Development, Gainesville, USA.

Jervis, M.H. 1994. Galapagos goldrush. IUCN Bull. 1994(3):28-31.

Johnson, M. 1982. Camel's milk and Aloes. Cactus Succ. J. Gr. Br. 441:9-16.

Jonkers, B. and Walker, C.C. 1993. The asclepiads of Morocco - a short commentary. Asklepios 59:14-21.

Judd, E. 1967. What aloe is that? Fuméü, Cape Town.

Jürgens, N. 1990. Remarks on the biogeography of Mesembryanthemaceae and their possible use in other arid regions. Mitteilungen aus dem Instituí f'iir Allgemeine Botanik Hamburg 23b: 1047-1060.

Jürgens, N. 1991. A new approach to the Namib Region. I: Phytogeographic subdivision. Vegetado 97:21 -38.

Kattermann, F. 1994a. Eriosyce (Cactaceae): The genus revised and amplified. Succ. PL Res. 1.

Kattermann, F. 1994b. Eriosyce. Succ. PI. Res., vol. 1.

Kent, C.M. 1980. Aloe vera. Privately published, Arlington, Virginia.

Kiesling, R. 1986. Frost resistent cacti of Argentina. Cactus Succ. J. (US) 59:18-25.

Kiesling, R. 1990. Cactus de la Patagonia. Colección Cientifica del INTA, Buenos Aires. [Edition including an extended English summary of the author's contribution to Flora Patagónica vol. 5, 1988.1

Kiesling, R. and Ferrari, 0. 1985. Field trip guide for the XIX IOS Congress. IOS Bull. 44:133- 143.

Killeen, T.J., Garcia E., E., and Beck, S.G. 1993. Vegetación de Bolivia. In: Guía de árboles de Bolivia, pp. 6-24. Herbario Nacional de Bolivia and Missouri Botanical Garden.

Kimberley, M.J. 1971. The protection of indigenous flora in Rhodesia. Excelsa 1:55-60.

Kimberley, M.J. 1975. Plant protection legislation in Rhodesia. Excelsa 5:3-16.

Kimberley, M.J. 1980. Specially protected plants in Zimbabwe. Excelsa 9:53-54.

Kimberley, M.J. 1991. Specially protected indigenous plants in Zimbabwe and a proposal to establish further botanical reserves in Zimbabwe to protect representative communities of succulent plants, with descriptive notes on protected species. Excelsa 15:4753.

Kimberley, M.J. 1993. Zimbabwe and its succulents. Aloe 30:108-111.

Kimnach, M. 1982. Selenicereus innesii, an aberrant new species from the West Indies. Cactus Succ. J. (US)

Kingdon, J. 1990. Island Africa. The evolution of Africa's rare animals and plants. Collins, London.

Klackenberg, J. 1992. Taxonomy of Secamone s. lat. (Asclepiadaceae) in the Madagascar Region. Opera Botanica 112: 1126.

Kraus, R. (ined.). The environmental conditions of cacti in Chile. Haseltonia (submitted).

Krauss, F. 1991. Biodiversity conservation on Guana Island, B.V.I. In: G. Cambers (ed), Proceedings of the Regional Symposium on public and private cooperation in National Park Development. B.V.I. National Parks Trust.

Kuchar, P. 1985. The plants of Somalia: an overview and checklist. CRDP Tech. Rep. Ser., no. 16.

Kunze, H., Meve, U., Liede, S. 1994. Cibirhiza albersiana, a new species of Asclepiadaceae, and establishment of the tribe Fockeeae. Taxon 43:367-376

Laguna, E. 1996. The Life-EEC project for the creation of a micro-reserve areas network for the endemic flora of the Community (Spain). Plan ta Europa: Proceedings of the First European Conference on the Conservation of Wild Plants. Hyéres, France, 2-8 September 1995.

Lavranos, J.J. 1972. Notes on the succulent flora of northeast Africa and southern Arabia. Cactus Succ. J. (US) 44:257-261

Leach, L.C. 1978. A contribution towards a new classification of Stapelieae (Asclepiadaceae) with a preliminary review of Orbea Haw. and descriptions of three new genera. Excelsa Tax. Ser. 1:1-75

Leach, L.C. 1980. A review of Tridentea Haw. (Asclepiadaceae). Excelsa Tax. Ser. 2:1-68

Leach, L.C. 1985. A revision of Stapelia L. Excelsa Tax. Ser. 3:1-157.

Legrand, C.D. 1962. Las especies americanas de Portulaca. An. Mus. Hist. Nat. Montevideo 27:1.

Leon, Hno. and Hno. Alain. 1946-1953. Flora de Cuba. Vol. 5. Reprint by 0. Koeltz Sc. Publ., Koenigstein, Germany.

Leuenberger, B.E. 1986. Pereskia (Cactaceae). Mem. New York Bot. Card. 41.

Liede, S. 1993. Milkweed life forms. Nat. Geog. Res. Expl. 8:108-115

Liede, S., and Albers, F. 1994. Tribal disposition of genera in the Asclepiadaceae. Taxon 432:201-231.

Liede, S. and Meve, U. 1992. The genera of leafless Cynanchinae (Asclepiadaceae) in Africa. Cactus Succ. J. (US) 64:30-36.

Liede, S., Meve, U. and Mahlberg, P.G. 1993. On the position of the genus Karimbolea (Asclepiadaceae). Am. J. Bot. 80:215-221.

Linnaeus, C. 1753. Species plantarum. Vol. 1 (1st edn.) Impensis Laurentii Salvii, Stockholm.

Liogier, A.H. 1982-1989. La Flora de La Espanola. Vol. 5. San Pedro de Macoris, R. Dominicana.

Lourteig, A. 1991. El genero Montia (Portulacaceae) en el hemisferio austral. Rev. Acad. Colomb. Cienc. Exact. Fis.Nat. 18:41-48.

Liogier, A.H. and Martorell, L.F. 1982. Flora of Puerto Rico and Adjacent Islands: A systematic Synopsis. Universidad de Puerto Rico, Rio Piedras, Puerto Rico.

Lucas, G. and Synge, H. 1978. IUCN Plant Red Data Book. IUCN, Morges, Switzerland.

Luke, W.R.Q. 1991. A preliminary list of rare, vulnerable, endangered and endemic succulents for Kenya. In: National Biodiversity Unit, 1992.

Macdonald, I.A.W. 1989. Man's role in changing the face of southern Africa. In: B.J. Huntley (ed), Biotic Diversity in Southern Africa: Concepts and Conservation, pp. 51-77. Oxford University Press, Cape Town.

Macdonald, I.A.W., Kruger, F.J. and Ferrar, A.A. 1986. The Ecology and Management of Biological Invasions in Southern Africa. Oxford University Press, Cape Town.

Mace, G. and Lande, R. 1991. Assessing extinction threats: toward a reevaluation of IUCN threatened species categories. Conserv. Biol. 5:148-157.

Mace, G., and Stuart, S. 1994. Draft IUCN Red List Categories, Version 2.2. Species 21/22: 13-24.

Mace, G., Collar, N, Cooke, J., Gaston, K., Ginsberg, J., Leader Williams, N, Maunder, M. and Milner-Gulland, E.J. 1993. The development of new criteria for listing species on the IUCN Red List. Species 19:16-22.

Mackinnon, J. and Mackinnon, K. 1986. Review of the protected areas system in the Afrotropical Realm. IUCN/UNEP.

Madsen, J.E. 1989. Cactaceae. Flora of Ecuador, 35.

Maggs, G.L., Kolberg, H.H. and Hmes, C.J.H. 1994. Botanical diversity in Namibia - an overview. In: B.J. Huntley (ed), Botanical Diversity in Southern A frica. Strelitzia 1:93-104. National Botanical Institute, Pretoria.

Martin, F.W. and R.M. Farmer. 1975. The spoilage of the breeding ground of the Turk's Cap. Cactus Succ. J. (US), suppliment to 47:29-32. Marx, G. 1993-. Euphorbias of Cape Province in The

Euphorbia J. vols. 8-, Mathews, B. 1989. The genus Lewisia. The Royal Botanic Gardens, Kew.

Matuda, E. and Piña Lujan, I. 1980. Las Plantas Mexicanas del género Yucca. Coleccion Miscelánea Estado de Mexico, Toluca, Estado de Mexico. Maxted, N, van Slageren, M.W. and Rihan, J.R. 1995. Ecogeographic surveys. In: Guarino, L., Ramanatha Rao, V. and Reid, R. (eds), Collecting plant genetic diversity. Technical guidelines. CAB International, Wallingford, UK. McNeill, J. 1974. Synopsis of a revised classification of the

Portulacaceae. Taxon 32:725-728. McNeill, J. 1975. A generic revision of Portulacaceae tribe Montieae using techniques of numerical taxonomy. Canadian J. Bot. 53:789-809. McVaugh, R. 1989. Flora Novo-Caliciana. Vol. 15. Bromeliaceae to Dioscoreaceae. University of Michigan Herbarium, Ann Arbor. Mee, M. 1988. In search of Flowers of the Amazon Forests.

Nonesuch Expeditions. Meregalli, M. 1991. 11 genere Copiapoa. Piante Grosse

Metzing, D. 1994. Cactaceae in Paraguay - specie, ecologia e minaccia di estinzione / Kakteen in Paraguay -Arten, Oekologie und Gefahrdung. Piante Grasse 13(4suppl.):5-63. [Correction slip issued by author, May 1994.1 Meve, U. 1994. The genus Piaranthus R.Br.

(Asclepiadaceae). Bradleya 12 Meve, U. (in press). A monograph of Duvalia

(Asclepiadaceae). Pl. Syst. Evol. Meve, U. and Liede, S. 1994. Floral biology and pollination in stapeliads - new results and a literature review. PI. Syst. Evol. 192:99-116. Moscoso, R.M. 1941. Las Cactaceas de la Flora de Santo

Domingo. An. Univ. Sto. Domingo 5 1-2:58-90. Moscoso, R.M. 1943. Catalogus Florae Domingensis. I. Spermatophyta. L. and S., New York; Supp. by J.J. Jimenez, 1966, Italy. Moss, H. 1994. Conservation of plant genetic resources in southern Africa. In: B.J. Huntley (ed), Botanical Diversity in Southern Africa. Strelitzia 1:329-341. National Botanical Institute, Pretoria. Moyo, S., O'Keefe, P. and Sill, M. 1993. The Southern African Environment. Earthscan Publications Ltd., London.

Müller, M.A.N. 1985. Endemie aloes of South West Africa. South West Africa Annual, pp. 111-116. South West Africa Publications Pty Ltd., Windhoek.

Nabhan, G. and Fleming, T. 1992. The conservation of mutualisms. Species 19:32-34.

Nabhan, G.P. et al. 1989. Plants at risk in the Sonoran Desert: an international concern. Agave 33: 14-15.

National Biodiversity Unit. 1992. The cost benefits and unmet needs of biological diversity conservation in Kenya.

Newton, D. 1993. Is export industry endangering the bitter aloe? Our Living World September 1993: 10.

Newton, D. and Bodasmg, A. 1994. TRAFFIC, wildlife trade monitoring and the South African plant trade. In: B.J. Huntley (ed), Botanical Diversity in Southern Africa. Strelitzia 1:319-328. National Botanical Institute, Pretoria.

Newton, L. 1991. Commercial exploitation of aloes in Kenya: a case of harmful conservation laws. IOS Bull. 5(3):95.

Newton, L. 1995. Succulent Plants in Kenya. Report for the Plant Conservation Programme of the National Museums of Kenya.

Nicoll, M.E. and Langrand, 0. 1989. Madagascar: Revue de la conservation et des aires protégées. WWF.

Nobel, P. 1988. Environmental Biology of Agaves and Cacti. Cambridge University Press, Cambridge.

Nolte, C.B. 1992. Strategic Alternatives for the Conservation of Succulent Plants. Unpublished Masters Thesis in Business Administration, University of the Witwatersrand, Johannesburg.

Nordenstam, B. 1969. Phytogeography of the genus Euryops Compositae. Opera Botanica23:5-77.

Nyananyo, B.L. 1986a. The systematic position of the genus Calyptrotheca Gilg (Portulacaceae). Feddes Reprium 97:767-769.

Nyananyo, B.L. 1986b. The taxonomic position of Talinella Baillon (Portulacaceae). Feddes Reprium 97:771-773.

Nyananyo, B.L. 1986c. The taxonomic position of Ceraria Pears, and Steph., Portulacaria Jacq., and Silvaea Phil. Feddes Reprium 97:775-777.

Nyananyo, B.L. 1987. Taxonomic studies in the genus Portulaca L. (Portulacaceae). Feddes Reprium 98:399402.

Nyananyo, B.L. 1989. Taxonomy of the endemic African genera of the Portulacaceae Centrospermae. Feddes Reprium 100:235-239.

Nyananyo, B.L. 1990. Tribal and generic relationship in the Portulacaceae Centrospermae. Feddes Reprium 101:237-241.

Oldfield, S. 1990. IOS Code of Conduct. Piante Grasse Vol. 10, supp. 4.

Oldfield, S. 1991. Review of significant trade in species of plants included in Appendix II of CITES. Report prepared for the 8th meeting of the Conference of the Parties. WCMC, Cambridge, UK.

Oldfield, S. 1993. International trade in aloes. TRAFFIC Bull. 14:25-32.

Olwell, P. 1992. 1992 Plant Conservation Directory. Center for Plant Conservation, St Louis, Missouri.

Palamarev E. 1989. Paleobotanical evidences of the Tertiary history and origin of the Mediterranean sclerophyll dendroflora. PL Syst. Evol. 162:93- 107.

Percy-Lancaster, A. and Richards, D. 1991. A provisional checklist of Zimbabwean succulents, caudiciforms and pachycauls. Excelsa 15:69-79.

Phillipson, P.B. 1994. Madagascar. In: WWF and IUCN, Centres of Plant Diversity: A guide and strategy for their conservation. Vol. 1, pp. 271-281. IUCN Publications Unit, Cambridge, UK,

Piña Lujan, I. 1978. Hesparaloe. Cactaceas Sucul. Mexicanas 233:54-55.

Piña Lujan, I. 1985. Consideraciones sobre el género Manfreda. Cactaceas Sucul. Mexicanas 30:27-32, 56-64, 84-91: 31:12-18, 34-36.

Pinkava, D. and Baker, M. 1985. Chromosome and hybridization studies of Agave. Desert Plants 72:93- 100.

Plowes, D.C.H. 1989. Succulents in Botswana. Excelsa 14:85-90.

Plowes, D. 1992. Leachiella Plowes: Stapelieae (Asclepiadaceae) a new generic name. Asklepios

Pollock, J.I. 1986. Primates and conservation priorities in Madagascar. Oryx 20:209-216.

Ponce, M. and Trujillo, B. 1990. Diagnóstico del grado de amenaza de Cactaceas endemicas de provincias biogeograficas que ocurren en Venezuela. Emestia 5860:9-17.

Powell, M. 1988. Trees and shrubs of the Trans-Pecos Texas. Big Bend Natural History Association.

Praeger, R.L. 1921a. An account of the genus Sedum as found in cultivation. J. Roy. Hort. Soc. 46:1-3 14.

Praeger, R.L. 1921b. An account of the Sempervivum group. Royal Horticultural Society, London.

Prendergast, H.D.V. 1994. Seeds at the Royal Botanic Garden, Kew — from field to bank for users and the future. Dinteria 24:3-17.

Preston-Mafham, K. 1991 Madagascar - a natural history. Facts on File, Oxford.

Proctor, G.R. 1984. Flora of the Cayman Islands. H.M.S.O., London

Putney, A.D. 1982. Survey of conservation priorities in the Lesser Antilles. Final Report. CCA Caribbean Environment Techn.Rep. No. 1.

Raidán, G. et al. 1985. Perfil ambiental del Paraguay, pp. 1193. Instituto Internacional para el Desarrollo y Medio Ambiente y Agencia para el Desarrollo Asuncion, Paraguay.

Rauh, W. 1963. Didiereacees. In: Humbert, H. Elore de Madagascar, 121e Famille. Paris.

Rauh, W. 1977a. The xerophytic vegetation of Southwestern Madagascar. Cactus Succ.J. (US) 493:99-103.

Rauh, W. 1977b. The xerophytic vegetation of Southwestern Madagascar. Part II. Cactus Succ.J. (US) 494:155-160. Rauh, W. 1977c. The xerophytic vegetation of Southwestern Madagascar. Part III. Cactus Succ.J. (US) 495:197-204. Rauh, W. 3977d. The xerophytic vegetation of Southwestern Madagascar. Part IV. Cactus Succ. J. (US) 496:269-273. Rauh, W. 1978a. The xerophytic vegetation of Southwestern Madagascar. Part V. Cactus Succ. J. (US) 501:11-15. Rauh, W. 1978b. The xerophytic vegetation of Southwestern Madagascar. Part VI. Cactus Succ. J. (US) 502:55-61. Rauh, W. 1978c. The xerophytic vegetation of Southwestern Madagascar. Part VII. Cactus Succ. J. (US) 503:119-121. Rauh, W. 1978d. The xerophytic vegetation of Southwestern Madagascar. Conclusion. Cactus Succ. J. (US) 505:226-229. Rauh, W. 1979. Problems of Biol. Conserv. in Madagascar. In: Bramwell, D. (ed), Plants and Islands. Academic Press, London. Rauh, W. 1983-. Euphorbias of Madagascar in The Euphorbia J.

Rauh, W. 1983a. The succulent vegetation of Madagascar, The "Plateau Central". Cactus Succ.J. (US) 553:124127.

Rauh, W. 1983b. The succulent vegetation of Madagascar, The "Plateau Central" Part II. Cactus Succ.J. (US) 554: 147-161.

Rauh, W. 1983c. The succulent vegetation of Central Madagascar, Part III-The genus Kalanchoe. Cactus Succ.J. (US) 555:201-208. Rauh, W. 1992- Various articles in Cactus Succ.J. (US)

and in Kakt. and Sukk. Rauh, W. 1995. Succulent and Xerophytic Plants of Madagascar, Vol. 1. Strawberry Press, California, USA.

Rawe, R. 1968. Succulents in the Veld. Howard Timmins, Cape Town.

Rebelo, A.G. 1994. Iterative selection procedures: centres of endemism and optimal placement of reserves. In: B.J. Huntley (ed), Botanical Diversity in Southern Africa. Strelitzia 1: 231-257. National Botanical Institute, Pretoria. Reichenbacher, F. 1985. Conservation of southwestern agaves. Desert Plants 72:103-106, 88. Reynolds, G.W. 1966. The aloes of tropical Africa and Madagascar. The Trustees, the Aloes Book Fund, Mbabane.

Reynolds, G.W. 1982. The aloes of South Africa (4th edn).

A.A. Balkema, Cape Town. Ricci, M. 1994. Noticiero del Jardín Botánico Nacional Viña del Mar 21. CONAF, V Region, Chile.

Richardson, M. 1992. Plant conservation at the Australian National Botanic Gardens. In: G. Butler, L. Meredith, and M. Richardson (ed). Conservation of Rare oi Threatened Plants in Australasia, pp. 5 1-55. Australian National Botanic Gardens, Canberra.

Richardson, M. 1994. The botanic garden seed list - a curse to plant conservation? Bot. Gard. Conserv. News

Rizzini, C.T. and Mattos-Filho, A. 1992. Contribuido ao conhecimento das floras do nordeste de Minas Gerais e da Bahia Mediterránea. Estudos e Contribuiqöes No. 9. IBAMA, Jardim Botánico Rio de Janeiro.

Rizzini, C.T. 1989. Cactiform species of Euphorbia from Brazil (Euphorbiaceae). Revta Brasil. Biol. 49:979-997, 1989 publ. 1990.

Roberts Renecke, P. 1965. The genus Astroloba Uitewaal (Liliaceae). M.Sc. Thesis, University of Cape Town, Cape Town.

Rowley, G.D. 1954. Cytology and the succulent. National Cactus Succ.J. (UK)9:15-19

Rowley, G.D. 1978. The Encyclopedia of Succulents and Cacti. Leisure Books, Belgium.

Rowley, G.D. 1992. Didiereaceae - 'Cacti of the Old World'. British Cactus and Succulent Society.

Rubluo, A. et al. 1993. Strategies for the recovery of endangered orchids and cacti through in vitro culture. Biol. Conserv. 63:163-169.

Rundel, P.W., Dillon, M.O., Palma, B., Mooney, H.A., Gulmon, S.L. and Ehlmger, J.R. 1991. The Phytogeography and Ecology of the Coastal Atacama and Peruvian Deserts. Aliso 13 1: 1-49.

Rutherford, M.C. and Westfall, R.H. 1986. Biomes of southern Africa - an objective categorization. Mem. Bot. Surv. South Africa No. 54:1-98.

Sanchez-Mejorada R., H. 1982. Mexico's problems and programmes monitoring trade in common and endangered cacti. Cactus Succ.J. Gr. Br. 442:36-38.

Sanchez-Mejorada R., H., Anderson, E.F. and Taylor, N.P. and R.E. 1986. Succulent Plant Conservation Studies and Training in Mexico. Stage 1, part 1: May-June 1986. Unpublished report for WWF-US.

Schlechter, R. 1905. Periplocaceae. In: K. Schumann and K. Lauterbach. Nachtrage zur Flora der deutschen Schutzgebiete in der Sudsee. 351-353.

SEDESOL 1993. The Protected Natural Areas of Mexico.

Siegfried, W.R. 1989. Preservation of species in southern African nature reserves. In: B.J. Huntley (ed), Biotic Diversity in Southern Africa: Concepts and Conservation, pp. 186-201. Oxford University Press, Cape Town.

Singh, M. 1994a. Succulent Euphorbiaceae of India. Meena Singh, New Delhi, India.

Singh, M. 1994b. President the Indian Society of Cacti and Succulents, in Zitt.

Smith, G.F. 1989. The destruction of the natural habitat of Aloe bowiea (Asphodelaceae: Alooideae). Excelsa 14:117-124.

Smith, G.F. 1991a. The chromosomes of Chortolirion and Poellnitzia (Asphodelaceae: Alooideae). Bothalia

Smith, G.F. 1991b. Studies on the reproductive biology and palynology of Chortolirion Berger (Asphodelaceae: Alooideae) in southern Africa. Taxon 40:61-73.

Smith, G.F. 1991c. Populations of Haworthia fasciata are dwindling in urban Port Elizabeth, Eastern Cape, South Africa. Br. Cactus Succ. J. 9: 42-44.

Smith, G.F. 1994. Conservation — is there a solution? Aloe 31:17-20.

Smith, G.F. and Van Wyk, B-E. 1991. Generic relationships in the Alooideae (Asphodelaceae). Taxon 40:557-581.

Smith, G.F. and Van Wyk, A.E. 1992a. Pollen morphology of the monotypic genus Poellnitzia (Alooideae: Asphodelaceae). South African J. Bot. 58:90-93.

Smith, G.F. and Van Wyk, A.E. 1992b. Systematic leaf anatomy of selected genera of southern African Alooideae (Asphodelaceae). South African J. Bot. 58:349-

Smith, G.F., Hobson, S.R., Meyer, N.L., Cheselet, P., Archer, R.H., Burgonye, P.M., Glen, H.F. Herman, P.P.J., Retief, E., Smithies, S.J., Van Jaarsveld, E.J. and Welman, W.G. 1993. Southern African succulent plants - an updated synopsis. Aloe 30:32-74.

Smith, G.F., Hobson, S.R., Meyer, N.L., Chesselet, P., Archer, R.H., Burgoyne, P.M., Glen, H.F., Herman, P.P.J., Retief, E., Smithies, S.J., Van Jaarsveld, E.J. and Welman, W.G. 1993. Southern African succulent plants - an updated synopsis. Aloe 30:31-76.

Smith, G.F., Van Jaarsveld, E.J., Arnold, T.H., Steffens, F.E., Dixon, R.D., & Retief, J.A. (eds) 1997. List of Southern African Succulent Plants. Umdaus Press, Pretoria.

Smith, L.B. and Downs, R.J. 1974. Bromeliaceae-Pitcairnioideae. Flora Neotropica Monogr. 141.

Standley, P.C. 1920-26. Trees and Shrubs of Mexico. Contrib. US. Nat. Herb. 23:1-1721.

Stebbins, G.L. 1952. Aridity as a stimulus to plant evolution. American Naturalist. 86:33-44.

Supthut, D. and von Arx, B. 1993. Madagascar 92. Rapport de Mission. Unpublished report submitted to CITES Secretariat.

Supthut, D. in litt. Information on conservation status of species and threats to wild plants.

Suzan, H. et al. 1989. Evaluación de plantas amenazadas y en peligro de extinción en el estado de Tamaulipas. Biotam 11.

Synge, H. 1991. Conserving the wild plants of Gran Canaria. Cabildo Insular de Gran Canaria (CIGC)/WWF, IUCN.

Takhtajan, A. 1986. Floristic Regions of the World. University of California Press, Berkeley and Los Angeles.

Talukdar, S. 1983. The conservation of Aloe polyphylla endemic to Lesotho. Bothalia 14:985-989.

Talukdar, S. 1994. Botanical diversity and its conservation in Lesotho. In: B.J. Huntley (ed), Botanical Diversity in Southern Africa. Strelitzia 1:75-92. National Botanical Institute, Pretoria.

Taylor, N.P. 1985. The Genus Echinocereus. Royal Botanic Gardens, Kew.

Taylor, N.P. 1991a. Generic reserve collections. IOS Bull. 53:104-05.

Taylor, N.P. 1991b. The genus Melocactus (Cactaceae) in Central and South America. Bradleya 9:1-80.

Taylor, N.P. 1992. Plants in Peril, 17. Melocactus conoideus. Kew Magazine 93:138-142.

Taylor, N.P. and D.R. Hunt. 1988. IOS generic reserve collections: draft regulations. IOS Bull. 47:262-63.

Taylor, N.P. and Zappi, D.C. 1992. Cactaceae do Vale do Rio Jequitinhonha Minas Gerais. Acta Bot. Bras. 51:63-69, 1991 publ. 1992.

Taylor, N.P. and Zappi, D.C. unpubl. The Cacti Of Eastern Brazil. Royal Botanic Gardens, Kew.

Timberlake, J.R. and Müller, T. 1994. Identifying and describing areas for vegetation conservation in Zimbabwe. In: B.J. Huntley (ed), Botanical Diversify in Southern Africa. Strelitzia 1:125-139. National Botanical Institute, Pretoria.

Tolken, H.R. 1969. The genus Talinum in southern Africa. Bothalia 10:19-28.

Tolken, H.R. 1977. A revision of the genus Crassula in Southern Africa. The Bolus Herbarium, Cape Town.

Uhl, C.H. 1992. Polyploidy, dysploidy, and chromosome pairing in Echeveria (Crassulaceae) and its hybrids. Am. J. Bot. 79:556-566.

UNEP 1992. Convention on Biological Diversity. United Nations Environment Programme, Nairobi.

U.S. Fish and Wildlife Service. 1990. Report to Congress: Endangered and Threatened Species Recovery Program. U.S. Department of the Interior, Fish and Wildlife Service, Washington, D.C.

Van Jaarsveld, E. 1987. The succulent riches of South Africa and Namibia and their adaptive strategies. Aloe 24 (3) and (4):46-92.

Van Jaarsveld, E.J. 1992. The Genus Gasteria, a synoptic review. Aloe 29: l-30.

Van Jaarsveld, E.J. 1994. Gasterias of South Africa.

Press, Cape Town.

Verhoek, S. 1975. A study of the tribe Poliantheae including Manfreda and revisions of Manfreda and Prochynanthes Agavaceae. Doctoral Dissertation, Cornell University.

Villa-Lobos, J. (in press). Threatened Plants of Middle America. Smithsonian Institution, Washington, DC.

Villasenor, J.L., Davila, P. and Chiang, F. 1990. Fitogeografia del Valle de Tehuacan-Cuicatlan. Bol. Soc. Bot. Mexico 50:135-149.

Walker, C.C. and Thorburn, M. 1991. Kleinia Senecio anteuphorbium L. Haw. - a Moroccan endemic. Aloe 281:18-21.

Walker, C.C. and Thorburn, M. 1992. Moroccan memories. The Ca et us File February 1992.

Walker, C.C. 1979. Stapelianthus - an introduction. Asclepiadaceae 17:5-8.

Walter, H. and Breckle, S.-W. 1984. Ökologie der Erde. Bd. 2. Spezielle Ökologie der tropischen und subtropischen Zonen. Stuttgart.

Walter, H. 1964. Vegetation der Erde I. Jena.

Walther, E. 1972. Echeveria. California Academy of Sciences. San Francisco.

WCMC. 1991. Protected areas of the world: A review of national systems. Vol 3: Afrotropical. TUCN, Gland, Switzerland and Cambridge, UK

WCMC. 1992. Protected Areas of the World: A review of national systems. Vol. 4: Neartic and Neotropical. IUCN, Gland, Switzerland and Cambridge, UK.

WCMC. 1993. Zimbabwe: Conservation Status Listing of Plants. Unpublished report produced by the Threatened Plants Unit of the World Conservation Monitoring Centre, Cambridge.

Webber, J. 1953. Yuccas of the Southwest. Agriculture Monograph 17. U.S. Department of Agriculture, Washington, DC.

Werger, M.J.A. 1978. Biogeographical divisions of southern Africa. In: M.J.A. Werger (ed), Biogeography and Ecology of Southern Africa, pp. 145-170. Junk, The Hague.

West, 0. 1974. A field guide to the aloes of Rhodesia. Longman, Salisbury.

White, F. 1983. The Vegetation of Africa. UNESCO, Paris.

White, A. and Sloane, B.L. 1937. The Stapeliac Vol. 1-3. (2nd edn). Abbey Press, Pasadena, CA, USA.

White, A., Dyer, R.A. and Sloane, B.L. 1941. The Succulent Euphorbieae, Southern Africa. Abbey Press, Pasadena, CA, USA.

Wieland, G.D. 1995. Guidelines for the Management oj Orthodox Seeds. Center for Plant Conservation, St. Louis.

Willert, D.J. von, Eller, B.M., Werger, M.J.A., Brinckmann, E. and Ihlenfeldt, H.D. 1992. Life strategies of succulents in deserts, with special reference to the Nomib Desert. Cambridge University Press, Cambridge, U.K.

Woodson R.E. 1954. The North American Specks of Asclepias L. Ann. Missouri Bot. Card. 4 1: 1-2 11.

WWF and IUCN. 1994-1997. Centres of Plant Diversity: A guide and strategy for their conservation. 3 volumes. IUCN Publications Unit, Cambridge, UK.

Wyse Jackson, P.S. 1993. Some recent trends and developments in botanic gardens worldwide. In: Oates. M. (ed), People, Plants, and Conservation: Botanic Gardens into the 21st Century. Royal New Zealand Institute of Horticulture, Christchurch.

Yamagishi, T., Haruna, M., Yan, X-Z., Chang, J-J., Lee, K-H. 1989. Antitumor agents, 110. 1,2 bryophyllin B, a novel potent cytotoxic bufadienolide from Bryophyllitm pinnatum. J. Nat. Products 52: 107 1 - 1079.

Zappi, D.C. and Taylor, N.P. 1994. Cactaceae del Brasile Orientale / Eastern Brazilian Cacti. Piante Grosse 134

Zappi, D.C. 1994. Pilosocereus Cactaceae, the genus in Brazil. Succ. PI. Res. 3:1- 160.

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