Key to Genera

Stamens shorter than the petals. Joints flat to terete, not ribbed. Testa of the seed thin, black, Maihuenia Joints terete, longitudinally Grusonia 1. PERESKIOPSIS Britton and Rose, Smiths. Misc. Coil. 50 331. 1907. Trees and shrubs, in habit and foliage similar to Pereskia old trunk forming a solid woody cylinder covered with bark and resembling the ordinary dicotyledonous stein areoles circular, spine-bearing or sometimes spineless, also bearing hairs,...

Opuntia soehrensii sp nov

Prostrate, in masses usually 1 meter in diameter or less joints at first ereet or aseending, finally prostrate and rooting and forming new eolonies, flattened, rather thin, somewhat tubereulate, very spiny, orbieular, 4 to 6 em. in diameter, often purplish spines slender, rather variable in eolor, usually yellow or brown, several from eaeh areole, sometimes as many as eight, the longest ones 5 em. long, ereet flowers light yellow, 3 em. long sepals brown filaments yellow style white...

Opuntia burrageana sp nov

Usually low and bushy, rarely 1 meter high stems slender, 1 to 2 cm. in diameter, densely spiny leaves small, 2 mm. long, green, early deciduous old stem and branches terete young joints Fig. 84. Opuntia prolifera Fig. 85. Opuntia alcahes. Fig. 84. Opuntia prolifera Fig. 85. Opuntia alcahes. cylindric to narrow- clavate, 15 cm. long or less areoles closely set tubercles rather low, not much broader than long spines numerous, similar, spreading, rarely 2 cm. long, all covered with thin,...

Key to Species

Joints readily detached, turgid, some of them subterete or subglobose 216. O. fragilis Joints not readily detached, usually flat and thin, or in O. arenaria sometimes turgid and Joints thinner than the last, mostly flat, larger. Spines, or some of them, very long, flexible and bristle-like. Spines stiff, acicular or subulate areoles distant. Spines subulate. Spines acicular, slender areoles close together. Ovary and fruit without O. sphaerocarpa Ovary and fruit with O. polyacantha 216. Opuntia...

Opuntia macracantha Grisebach Cat Pl Cub 116 1866

Erect, the trunk up to 15 cm. in diameter, its areoles 1 to 2 cm. broad, bearing many brownish glochids and several divergent spines 1 cm. long or less upper portion of the trunk, and the ultimate, oblong, or oblong-ovate, spreading branches flat, green, faintly shining, the areoles 2 to 3 cm. apart, scarcely elevated, the numerous glochids brown spines 1 to 4, up to 15 cm. long, nearly white, stout, subulate, or wanting flowers often numerous ovary 2.5 to 3 cm. long, densely beset with...

Opuntia pilifera Weber Dict Hort Bois 894 1898

Becoming 4 to 5 meters high, with a definite, thick, woody, cylindric trunk and a broad, rounded top joints oblong to orbicular, 1 to 3 dm. long, obtuse at apex, pale green leaves subulate, about 5 mm. long areoles 2 to 3 cm. apart, scarcely elevated spines 2 to 9, white, slightly spreading, acicular the outer part of the areole filled with nearly white, more or less deciduous hairs 2 to 3 cm. long flowers large, red areoles on the ovary bearing brown glochids and deciduous hairs, the latter...

Pterocactus fischeri sp nov

Stems low, 1 dm. high or less, spreading or erect, cylindric, 1.5 cm. in diameter, tuberculate leaves minute, acute tubercles about as long as broad, arranged in spiral ridges somewhat resembling those of Opuntia whipplei spines numerous, the radials 12 or more, white, setaceous, 6 mm. long, spreading centrals usually 4, 1 to 1.5 cm. long, brownish, the tips and bases often yellowish Seeds of three species of Pterocactus. Natural size. glochids numerous, yellowish, 3 to 4 mm. long flowers, in...

Opuntia Imbricata

Joints very readily detached, freely falling 30. O. fulgida Joints not very readily detached, persistent. Spines brown or reddish, at least at base. Branches slender fruit not proliferous 31. O. spinosior Branches stout fruit proliferous 32. O. prolifera Spines white petals greenish yellow, 1 cm. long or less 33. O. alcahes Spines yellow petals red, 2 cm. long 34. O. burrageana 30. Opuntia fulgida Engelmann, Proc. Amer. Acad. 3 306. Opuntia mamillata Schott in Engelmann, Proc. Amer. Acad....

Opuntia imbricata Haworth De Candolle Prodr 3 471 1828

Succ. 70. 1821. Cactus cylindricus James, Cat. 182. 1825. Not Lamarck. 1783. Cactus bleo Torrey, Ann. Lyc. N. Y. 2 202. 1828. Not Humboldt, Bonpland, and Kunth. 1823. Opuntia rosea De Candolle, Prodr. 3 471. 1828. Opuntia decipiens De Candolle, M m. Mus. Hist. Nat. Paris 17 118. 1828. Opuntia exuviata De Candolle, M m. Mus. Hist. Nat. Paris 17 118. 1828. Opuntia exuviata angustior De Candolle, M m. Mus. Hist. Nat. Paris 17 118. 1828. Opuntia exuviata...

Opuntia polyacantha Haworth Suppl Pl Succ 82 1819

Pl. 1 296. 1818. Not Willdenow. 1813. Opuntia media Haworth, Suppl. Pl. Succ. 82. 1819. Opuntia missouriensis De Candolle, Prodr. 3 472. 1828. Opuntia splendens Pfeiffer, Enum. Cact. 159. 1837. Opuntia missouriensis albispina Engelmann and Bigelow, Proc. Amer. Acad. 3 300. 1856. Opuntia missouriensis microsperma Engelmann and Bigelow, Proc. Amer. Acad. 3 300. 1856. Not O. rafinesquei microsperma Engelmann, Proc. Amer. Acad. 3 295. 1856. Opuntia missouriensisplatycarpa...

Opuntia juniperina sp nov

Somewhat of the habit of Opuntia polyacantha, but not so procumbent, stouter, and with fewer and stouter spines joints obovate, 10 to 12 cm. long, broad, rounded at top areoles small, all below the middle of the joint naked, the upper ones each bearing one stout spine and 1 to several very short accessory ones the longer spine very stout, 3 to 4 cm. long, brown flowers not known fruit dry, oblong, 3 cm. long, spineless, with a shallow, flat umbilicus seeds large, irregular, 6 to 8 mm. brniiH On...

Opuntia robusta Wendland in Pfeiffer

Gen. Nov. Sp. Opuntia larreyi Weber in Coulter, Contr. U. S. Opuntia gorda Griffiths, Monatsschr. Kakteenk. Often erect, sometimes 5 meters high, usually much branched joints orbicular to oblong, 20 to 25 cm. long by 10 to 12.5 cm. broad, very thick, bluish green, glaucous leaves 4 mm. long, reddish, acute spines 8 to 12, stout, very diverse, brown or yellowish at base, white above, up to 5 cm. long, but often wanting on greenhouse specimens flowers 5 cm. broad,...

Opuntia pittieri sp nov

Plant up to 5 meters high, with a rather definite cylindric spiny trunk joints large, 25 to 50 cm. long, 2 to 4 times as long as wide, narrowly oblong, green leaves subulate, with purple tips wool in young areoles dark brown to purple areoles elevated, rather large, 2 to 3 cm. apart spines 3 to 6, slightly spreading, acicular, white, the longest 2 to 2.5 cm. long glochids tardily developing, few, often wanting flowers deep orange, turning to scarlet ovary nearly globular, more or less spiny,...

Pereskia conzattii sp nov

Tree, 8 to 10 meters high bark of stems and branches brown and smooth leaves orbicular to obovate, acute, 1 to 2.5 cm. long areoles small, with short white wool and a few long hairs spines 2 to 6 on young branches, 10 to 20 on main stem, acicular, 2 to 2.5 cm. long, at first yellowish brown, dark brown in age flowers not known ovary bearing small scales fruit naked, pear-shaped, more or less stalked at base, 3 to 4 cm. long seeds black, glossy, 3 mm. long, with a small white hilum. Collected at...

Pterocactus tuberosus Pfeiffer

Cact. 146. 1837. Pterocactus kuntzei Schumann, Monatsschr. Kak-teenk. 7 6. 1 897. Pterocactus kurtzei Schumann in Engler and Prantl, Pflanzenfam. Nachtr. 259. 1897. Pterocactus decipiens G rke, Monatsschr. Kakteenk. 17 147. 1907 Roots tuber-like, single or in clusters, usually small but sometimes large and thick, up to 12 cm. long by 8 cm. in diameter, deep-seated, giving off several erect stems, these branching at surface of the ground terminal branches...

Textfigures

Hedge of Pereskia pereskia 7 2. Tree of Pereskia autumnalis 11 3. Branches of Pereskia autumnalis 12 4. Branch of Pereskia lychnidiflora 12 5. Leafy branch of Pereskia nicoyana 13 6. Branch of Pereskia zehntneri 13 7. Cultivated plant of Pereskia zehntneri . 14 8. Herbarium specimen of Pereskia moorei 15 9. Tree of Pereskia guamacho 15 10. Flowering branch of Pereskia guamacho 16 11. Leafy branch and flower of Pereskia 12. Branch and fruit of Pereskia bleo 18 13. Fruit of Pereskia...

Maihuenia patagonica Philippi

Opuntia patagonica Philippi, Linnaea 33 82. 1864. Pereskia philippii Weber, Dict. Hort. Bois 939. 1 898. Maihuenia philippii Weber in Schumann, Gesamtb. Kakteen 757. 1898. Low, much branched, and dense, resembling Semper-vivum tomentosum in habit joints subglobose, 1 to 1.5 cm. in diameter leaves subulate, green young areoles bearing white hairs spines weak, hardly pungent, white, the longest 10 to 15 mm. long flowers 2.8 to 3 cm. long fruit 8 to 10 mm. long, thicker than long leaves on the...

Opuntia caribaea sp nov

Stems i to 3 meters high, forming thickets in open woods and waste grounds ultimate joints horizontal, 5 to i0 cm. long, much thicker than in O. leptocaulis, with short, elevated tubercles areoles large, bearing white wool and a few long caducous hairs spines i to 3, porrect, acicular, 2 to 3 cm. long covered with thin, brown, papery sheaths glochids dark brown leaves small, i to 2 mm. long, acute flowers not known fruit red, 1.5 to 2 cm. long, usually naked but sometimes bearing short spines...

Pereskia bleo HBK De Candolle Prodr 3 75 1828

Cactus bleo Humboldt, Bonpland, and Kunth, Nov. Gen. et Sp. 6 69. 1823. Pereskiapanamensis Weber, Dict. Hort. Bois 739. 1898. A tree, sometimes 7 meters high trunk 10 cm. in diameter or less, when old becoming naked, but young shoots often bear large fascicles of spines (sometimes 25 or more) young branches red, leafy, its spines in fascicles of 5 and 6, but young shoots often bear but 1 to 4, black, acicular, up to 2.5 cm. long leaves thin, oblong to oblanceolate, 16 to 21 cm. long, 4 to 5.5...

Opuntia galapageia Henslow Mag Zool and Bot 1 467 1837

Hort. Bois 894. 1898. Opuntia helleri Schumann in Robinson, Proc. Amer. Acad. 38 180. 1902. Opuntia insularis Stewart, Proc. Calif. Acad. IV. 1 113. 1911. Sometimes low and creeping, but often becoming very large, 5 to 10 meters high, with a large top either open or very compact and rounded trunk at first very spiny and made up of flat joints set end to end, with the short axis of each joint at right angles to that of the adjacent joint, in time becoming terete,...

Opuntia pottsii Salm Dyck Cact Hort Dyck 1849 236 1850

Amer. Acad. 3 294. 1856. Low, spreading plant, 3 dm. high or less, from thickened tuberous roots 2 to 3 cm. in diameter, these sometimes moniliform joints broadly obovate, 3.5 to 12 cm. long, pale green to bluish areoles few, either small or large spines confined to the upper and marginal areoles, 1 or 2, slender, 2 to 4 cm. long, usually white but sometimes purplish glochids yellow, usually few but sometimes abundant flowers large, 6 to 7 cm. broad, deep...

Pereskia weberiana Schumann Gesamtb Kakteen 762 1898

Shrubby, much branched, glabrous, 2 to 3 meters high, the slender round branches about 3 mm. thick leaves ovate to elliptic, about 3 cm. long and 2 cm. wide, sessile, acute at the apex, obtuse at the base areoles circular, slightly elevated, the wool short, whitish, fading brown spines 3 to 6 at the lower areoles, solitary at the upper, 2 cm. long or less, terete, acicular, yellow or horn-colored flowers clustered, white, about 1 cm. long or less ovary about 2 mm. long, bearing a few white,...

Opuntia leptocaulis De Candolle Mem Mus Hist Nat Paris 17 118 1828

Dyck. 360. 1834. Opuntia gracilis Pfeiffer, Enum. Cact. 172. 1837. Opuntiafragilis frutescens Engelmann, Bost. Journ. Nat. Hist. 5 245. 1845. Opuntia virgata Link and Otto in Forster, Handb. Cact. 506. 1846. Opuntia vaginata Engelmann in Wislizenus, Mem. Tour North. Mex. 100. 1848. Opuntia frutescens Engelmann, Bost. Journ. Nat. Hist. 6 208. i85o. Opuntia frutescens brevispina Engelmann, Proc. Amer. Acad. 3 309. 1856. Opuntia frutescens longispina Engelmann,...

Opuntia megacantha Salm Dyck Hort Dyck 363 1834

Longleaf Cactus

Mo. Bot. Gard. 19 261. 1908. Opuntia incarnadilla Griffiths, Rep. Mo. Bot. Gard. 22 27. 1912. Plant tall, 4 to 5 meters high or more, with a more or less definite woody trunk joints of large plants obovate to oblong, often oblique, sometimes 40 to 60 cm. long or more, but in greenhouse specimens often much smaller, pale dull green, slightly glaucous leaves minute, often only 3 mm. long, green or purplish areoles rather small, on large joints often to 5 cm....

Opuntia Skottsbergii

Opuntia floccosa Salm-Dyck, Allg. Gartenz. 13 388. 1845. Opuntia senilis Roezl in Morren, Belg. Hort. 24 39. 1874. Opuntia floccosa denudata Weber, Dict. Hort. Bois 897. 1898. Opuntia hempeliana Schumann, Gesamtb. Kakteen 690. 1898. Plant growing in clumps or low mounds sometimes 1 to 2 meters in diameter, with hundreds of short, erect branches joints oblong, 5 to 10 cm. long, usually hidden under a mass of long white hairs coming from the areoles spines usually...

Opuntia vulgaris Miller Gard Dict ed 8 No 1 1768

Pl. Suppl. 33. 1813. Opuntia monacantha Haworth, Suppl. Pl. Succ. 81. 1819. Cactus urumbeba Vellozo, Fl. Flum. 207. 1825. Cactus indicus Roxburgh, Fl. Indica 2 475. 1832. Cactus chinensis Roxburgh, Fl. Indica 2 476. 1832. Opuntia monacantha gracilior Lemaire, Cact. Gen. Nov. Sp. 68. 1839. Opuntia umbrella Steudel, Nom. ed. 2. 2 222. 1841. Opuntia roxburghiana Voigt, Hort. Suburb. Calcutt. 62. 1845. Opuntia monacantha deflexa Salm-Dyck, Cact. Hort. Dyck. 1849....

Opuntia mortolensis sp nov

Slender, 6 dm. high or less, dull green, with dark blotches below the areoles, the ultimate twigs short, sometimes only 2 cm. long, 4 to 5 mm. thick, scarcely tuberculate leaves ovate to ovate-subulate, 2 to 4 mm. long, green, with acute bronze-colored tips young areoles with numerous, early deciduous, weak white hairs sometimes longer than the leaves, and several brown glochids areoles of old branches with solitary acicular spines 3 to 5 cm. long, these with tightly fitting brownish sheaths...

Othe cactaceae

Joints elongated-lanceolate or oblong, several times longer than wide 175. O. linguiformis Joints obovate to suborbicular. Spines long. Spines subulate, up to 7.5 cm. 176. O. tapona Spines acicular, 4 cm. long or less. Spines nearly clear yellow, 177. O. littoralis Spines brown at base, long and 178. O. aciculata Areoles mostly 2.5 to 4 cm. apart. Bushy species. Spines yellow or yellowish 179. O. lindheimeri Spines pale yellow or 180. O. cantabrigiensis Depressed or procumbent 181. O....

Opuntia bahiensis sp nov

Trunk 3 to 15 meters high, cylindric, 20 to 25 cm. in diameter, tapering gradually upward the center of trunk pithy, hollow in age, surrounded by an open woody cylinder lateral joints terete, the terminal ones flat and thin, ovate to oblong leaves small, 2 to 3 mm. long, turgid spines on terminal joints, if present, 1 or 2, slender, red at first, then brown spines on old trunk forming large clusters at all the areoles flowers not seen fruit deep red both within and without, oblong, 3 to 4 cm....

Opuntia orbiculata Salm Dyck in Pfeiffer Enum Cact 156

Opuntia crinifera Salm-Dyck in Pfeiffer, Enum. Cact. 157. 1837. Opuntia crinifera lanigera Pfeiffer, Enum. Cact. 157. 1837. Opuntia lanigera Salm-Dyck, Cact. Hort. Dyck. 1849. 65. 1850. A plant without a very definite trunk, about 1 meter high, often broader than high joints green or bluish green, orbicular to obovate, sometimes spatulate, about 1 cm. long leaves subulate, to 3 mm. long areoles small, in seedlings and young plants producing long white hairs or wool long-persistent spines...