J54the cactaceae

deep; areoles 2 to 3 cm. apart; spines 9 to 12, the longer 3 to 5 cm. long, ascending; bud globose-ovoid, short-pointed, its scales with sparse curled grayish-white wool, 3 to 6 mm. long.

Type locality: Sea-beach between Rio Grande and Rio Ubero, Oriente, Cuba. Distribution: Known only from the type locality.

This plant was collected near the type locality of the preceding species; specimens of the two appeared to be different when first studied, but subsequent observations indicate that they may not be distinct; additional evidence is needed to determine this question. Figure 224 15 from a photograph of the type plant in its natural environment.

9. Harrisia aboriginum Small, sp. nov.

Plants 6 meters high or less, erect or reclining, simple or branched; ribs 9 to 11, rounded; areoles 1.5 to 3 cm. apart; spines 7 to 9, acicular, mostly 1 cm. long or less, sometimes longer, gray with brown tips when mature, pink when young; flower-buds densely brown-hairy; flowers slightly odorous, about 15 cm. long; scales of the ovary and flower-tube lanceolate, subtending short brown hairs; outer perianth-segments linear, acuminate, the inner oblanceolate, white, caudate-acuminate, erose-denticulate; fruit globular, yellow, 6 to 7.5 cm. in diameter.

On shell-mounds, western coast of Florida, north of the Ten Thousand Islands to Tampa Bay. Type collected by John K. Small on Terra Ceia Island, April 1919.

The type plants were found growing in shell heaps formed by the aborigines, whence the specific name.

10. Harrisia earlei sp. nov.

Pendent and prostrate on limestone rocks, 2 to 3 meters long, dark green, the old stems nearly or quite terete, 4 to 6 cm. in diameter and smooth, the younger branches 2 to 3 cm. in diameter, 5 to 7-angled, with spine-bearing areoles 2 to 4 cm. apart; spines gray, acicular, 5 to 8 at each areole, the longer 4 to 5 cm. long, ascending; flowers about 2 dm. long, the slender greenish tube about as long as the limb; ovary about 1 cm. in diameter, tubercled, bearing short subulate leaves, the areoles with short, white hairs; perianth-tube bearing distant, linear, acuminate scales 1 to 3 cm. long, the areoles with white hairs 1 to 1.5 cm. long; outer perianth-segments linear, greenish, acuminate, the inner somewhat broader, white, acute or acuminate; fruit yellow, depressed-globose, tubercled when young, nearly smooth when old, 6 to 7 cm. in diameter.

Limestone rocks, province of Pinar del Rio, Cuba. Type from San Diego de los Baños, August 31, 1910, collected by Britton, Earle, and Cager (No. 6667).

In habit and vegetative characters intermediate between typical Harrisiae and Erioce-

rei.

11. Harrisia tortuosa (Forbes).

Cereus tortuosus Forbes, Allg. Gartenz. 6: 5. 1838.

Cereus arendtii Hildmann and Mathsson in Schumann, Monatsschr. Kakteenk. 4: 173. 1894. Eriocereus tortuosus Riccobono, Boll. R. Ort. Bot. Palermo 8: 245. 1909.

Stem at first erect but soon arching, the slender, bright green branches 2 to 4 cm. thick; ribs few, usually 7, low, rounded, sometimes tuberculate, bright green; spines 6 to 10, subulate, the central one longer than the radials; flowers 12 to 15 cm. long; scales of the ovary and flower-tube ovate, about 1 cm. long, acute, bearing hair in their axils; outer perianth-segments narrow, dull colored; inner perianth-segments broader than the outer, acute, white to pink; stamens scarcely exserted; stigma-lobes green; fruit globular, tuberculate, red, 3 to 4 cm. in diameter, its areoles bearing a few short spines.

Type locality: Buenos Aires, Argentina. Distribution: Argentina.

Riccobono gives as a synonym of this species Cereus atropurpureus (Hocay, Cacteencult. 91). Under this name it is also briefly described in the Theodosia B. Shepherd Company's Descriptive Catalogue for 1916.

Cereus davisii (Monatsschr. Kakteenk. 14: 166. 1904) is an unpublished name; a specimen in the Succulent House at Kew indicates that it is related to H. tortuosa.

Illustrations: Monatsschr. Kakteenk. 14: 89. f. b; Rep. Mo. Bot. Gard. 16: pl. 9, f. 1; U. S. Dept. Agr. Bur. Pl. Ind. Bull. 262: pl. 7, all as Cereus tortuosus.

Plate xxi, figure 1, shows a flowering branch, figure 2 a fruiting branch, both from plants in the collection of the New York Botanical Garden.

12. Harrisia pomanensis (Weber).

Cereus pomanensis Weber in Schumann, Gesamtb. Kakteen 136. 1897.

Often prostrate or arched, bluish green and glaucous; ribs 4 to 6, rounded, obtuse; radial spines 6 to 8, 1 cm. long; central spine solitary, 1 to 2 cm. long; spines all subulate, when young white or rose-colored; flowers 15 cm. long; outer perianth-segments linear, acute; inner perianth-segments oblong, acutish, probably white; stigma-lobes numerous, linear; scales on ovary and flower-tube ovate, acute.

Type locality: Poman, Catamarca, Argentina. Distribution: Northwestern Argentina.

There is a living specimen of this species in the New York Botanical Garden (No. 39517). The stem is 4-angled, 2 cm. broad, and light green. The small areoles are 2 cm. apart and the acicular spines are less than 5 mm. long. The plant has not yet flowered.

Cereus bonplandii pomanensis Weber (Schumann, Gesamtb. Kakteen 137. 1897) is given as a synonym of this species. C. pomanensis grossei (Graebener, Monatsschr. Kakteenk. 19: 137. 1909) is only a mentioned name.

Illustrations: Rep. Mo. Bot. Gard. 16: pl. 7, f. 5, 6, both as Cereus pomanensis. Figure 225 is from a photograph of a flowering branch in the collection of Dr. Speg-azzini at La Plata, Argentina.

13. Harrisia martinii (Labouret).

Cereus martinii Labouret, Ann. Soc. Hort. Haute Garonne. 1854. Eriocereus martinii Riccobono, Boll. R. Ort. Bot. Palermo 8: 241. 1909. Cereus martiniiperviridis Weingart, Monatsschr. Kakteenk. 24: 72. 1914.

Plant much branched, clambering, 2 meters long or longer; old stems terete, spineless; young stems vigorous, about 2 cm. thick, pointed, 4 or 5-angled; areoles with a stout central spine 2 to 3 cm. long, straw-colored with a black tip and a row of short radials, sometimes half as long as the central one; flower about 2 dm. long; outer perianth-segments narrow, becoming pinkish, acuminate; inner perianth-segments broader, short-acuminate, white or tinged with pink; style green; ovary tuberculate; scales on ovary ovate, acuminate, on tube similar, becoming more elongate above, all with brown felt in their axils; fruit red, 3.5 cm. long, bearing small scales, the flowers withering-persistent.

Type locality: Not cited. Distribution: Argentina.

Cereus monacanthus Cels, not Lemaire, is not listed in the Index Kewensis, but it is cited by Schumann (Gesamtb. Kakteen 142. 1897) as a synonym of this species, quoting Cels, Catalogue, 1853. Here may belong Pilocereus monacanthus Lawrence in Loudon, Gard. Mag. 17: 319. 1841.

A plant of this species in the Kew collection is said by Mr. Weingart to be Cereus regelii (Monatsschr. Kakteenk. 20: 33. 1910).

Illustrations: Amer. Gard. 11: 569; Cycl. Amer. Hort. Bailey 1: f. 304 (both fruits spineless); Rep. Mo. Bot. Gard. 16: pl. 10, f. 1, 2; Rev. Hort. 94: f. 123 to 125, all as Cereus martinii.

Plate xix, figure 3, represents a fruiting branch, and plate xx, figure 2, a flowering branch, both painted from plants in the collection of the New York Botanical Garden.

14. Harrisia adscendens (Gürke).

Cereus adscendens Gürke, Monatsschr. Kakteenk. 18: 66. 1908.

At first erect, becoming much branched and bushy or sometimes with long clambering branches 5 to 8 meters long, 2 to 5 cm. thick; ribs 7 to 10, low, rounded, broken up into elongated tubercles;

trunk 2 to 4 cm. in diameter, with a woody cylinder, its center coarsely pithy; areoles large, rounded, subtended by small definite leaves like those of Opuntia; spines usually 10, stout, 2 to 3 cm. long, swollen at base, when young brownish or yellowish with brown tips; flowers 15 to 18 cm. long, opening at night; perianth-segments white; ovary bearing lanceolate acute scales with long hairs in their axils; fruit red, globular, tuberculate, 5 to 6 cm. in diameter, spineless, bearing scales and felt at the areoles, when mature splitting down on one side; flesh white, juicy; seeds large, black, mm. long.

Fig. 225.—Harrisia pomanensis. Fig. 226.—Harrisia adscendens.

Type locality: Near Tambury, Bahia, Brazil.

Distribution: In the subarid parts of the state of Bahia, Brazil.

Dr. Rose found this very common in Bahia, Brazil, either growing as a low bush in the open or clambering through bushes (No. 19730).

Illustration: Monatsschr. Kakteenk. 18: 67, as Cereus adscendens.

Figure 226 is from a photograph taken by Paul G. Russell at Barrinha, Bahia, in 1915. 15. Harrisia platygona (Otto).

Cereusplatygonus Otto in Salm-Dyck, Cact. Hort. Dyck. 1849. 199. 1850.

Eriocereusplatygonus Riccobono, Boll. R. Ort. Bot. Palermo 8: 242. 1909.

At first erect, but soon spreading; branches slender, 2 cm. in diameter or more, nearly terete, the 6 to 8 ribs flat or hardly elevated, separated only by shallow, narrow depressions, pale green or somewhat bronzed; spines 12 to 15, setaceous, very short, the longest only 12 mm. long; flowers 12 cm. broad; flower-tube 10 cm. long, bearing scales; ovary tuberculate, bearing scales, these woolly in their axils; stigma-lobes 14, linear.

Type locality: Not cited.

Distribution: Not known, probably South America.

BRITTON AND ROSE, VOL. II

PLATE XXI

1. Top of flowering branch of Harrisia fragrans.

2. Top of fruiting joint of Harrisia fragrans.

(Natural size.)

1. Top of flowering branch of Harrisia fragrans.

2. Top of fruiting joint of Harrisia fragrans.

(Natural size.)

This species has only once been reported as flowering, and then by Riccobono; our description of the flowers is based on his. We have studied a small plant in the collection of the New York Botanical Garden.

Illustration: Schumann, Gesamtb. Kakteen f. 19, as Cereus platygonus.

16. Harrisia bonplandii (Parmentier).

Cereus bonplandii Parmentier in Pfeiffer, Enum. Cact. io8. 1837.

Cereus balansaei Schumann in Martins, Fl. Bras. 42: 210. 1890.

Eriocereus bonplandii Riccobono, Boll. R. Ort. Bot. Palermo 8: 238. 1909.

Stems slender and weak, at first erect, up to 3 meters high or more, sometimes procumbent, arching or clambering, 3 to 8 cm. in diameter, strongly 4-angled; areoles 2 cm. apart; spines 6 to 8, acicular, the longest 4 cm. long, when young red, in age gray; flowers 15 to 22 cm. long, white, closing soon after sunrise; filaments numerous, borne almost to the base of the tube; style included; stigma-lobes numerous; fruit edible, globular, 4 to 6 cm. in diameter, red, bearing large scales with hairs in their axils, spineless, splitting on the side and exposing the white flesh and black seeds.

Fig. 227.—Harrisia bonplandii.

Type locality: Brazil.

Distribution: Paraguay, Argentina, and Brazil.

This species is widely cultivated, but under different names, one of which is Cereus acutangulus. The only specimens from wild plants which we have seen were collected by Thomas Morong at Trinidad, Paraguay, and by J. A. Shafer at Ascencion, Paraguay, and at Salta, Argentina. Cereus bonplandii brevispinus (Maass, Monatsschr. Kakteenk. 15: 119. 1905) is only mentioned, but Mr. Weingart says it is identical with the hybrid Cereus jusbertii.

Schumann's treatment of Cereus balansaei is confusing. In the Gesamtbeschreibung der Kakteen (p. 136) he refers it to Cereus bonplandii. In the Nachträge (p. 45) he puts the

Balansa specimen (No. 2504, type) here, but not the name, while in his Keys of the Monograph of Cactaceae (p. 17) he recognizes C. balansaei as well as C. bonplandii, referring to the former the Argentine species C. pomanensis.

Cereus rhodocephalus Lemaire (Cact. Gen. Nov. Sp. 7. 1839) 15 cited as a synonym of Cereus bonplandii.

We do not know Cereus ureacan-thus Förster, (Hamb. Gartenz. 17: 166. 1861); it is recorded as originally from Peru. Förster thought it might come next to Cereus bonplandii, but no species of this relationship have heretofore been reported from Peru.

Illustrations: Rep. Mo. Bot. Gard. 16: pl. 10, f. 3, 4, both as Cereus bonplandii.

Plate xxiv, figure 2, represents a fruiting branch of a plant in the collection of the New York Botanical Garden. Figure 227 is from a photograph taken by Dr. Shafer at Salta, Argentina, in 1917.

17. Harrisia guelichii (Spegazzini).

Cereus guelichii Spegazzini, Anal.

Branching, high-climbing on trees, up to 25 meters long, the branches 3 to 5 cm. thick, 3 or 4-angled; ribs acute, undulate; radial spines 4 or 5; central spine I, stouter than the radials; flowers large, green without; scales on the ovary and flower-tube prominent, nearly naked in their axils; fruit globular, strongly tuberculate, spineless, red, to 4.5 cm. in diameter; pulp white, very sweet, edible.

Type locality: In the Chaco, Argentina.

Distribution: Argentina.

We have a living specimen of this species brought by Dr. Rose from Argentina in 1915; from Dr. Spegazzini's description this must be the most elongated cactus known.

Illustration: Monatsschr. Kakteenk. 19: 19, as Cereus guelichii.

Figure 228 is from a photograph of a plant grown in the garden of Dr. Spegazzini, La Plata, Argentina.

PUBLISHED SPECIES, PERHAPS OF THIS GENUS. Cereus jusbertii Rebut in Schumann, Gesamtb. Kakteen 137. 1897.

Eriocereus jusbertii Riccobono, Boll. R. Ort. Bot. Palermo 8: 240. 1909.

Somewhat erect, from the first more or less branched; ribs 6, usually low, with broad intervals spines very short, the centrals a little longer than the radials; flowers funnelform; inner perianth' segments white; stigma-lobes numerous, linear, about 12, green; scales on ovary and tube with long hairs in their axils.

This plant, now common in living collections, is generally believed to be a hybrid. Berger says, "According to repeated assurances of Abbé Beguin, it is a hybrid between an Echinopsis and a Cereus raised by him."

Illustrations: Blühende Kakteen 2: pl. 78; Schumann, Gesamtb. Kakteen 32; Möllers, Deutsche Gärt. Zeit. 26: 305.

Cereus areolatus Muhlenpfordt in Schumann, Gesamtb. Kakteen 100. f. 20. 1897.

Cleistocactus areolatus Riccobono, Bol. R. Ort. Bot. Palermo 8: 264. 1909.

Described as columnar, somewhat branching, with 12 low, acutish ribs; ribs divided into tubercles by transverse lines running down from the areoles; radial spines 9 or 10, acicular; central spines 2 to 4, stouter, subulate; flowers and fruit unknown.

The above name was published in a garden catalogue in i860, while the plant was listed as Cereus dumesnilianus Labouret in Gruson's Catalogue.

This cactus is described from plants which are supposed to have come from the Andes of South America. The species is recognized by Schumann in his monograph and is placed in his series Graciles after Cereus platygonus. It has been in cultivation in the Berlin Botanical Garden and at La Mortola. From the latter source Dr. Rose obtained a specimen in 1914. This plant may be described as follows:

Ribs 15, low, rounded, with a deep horizontal groove just above the areoles; spines yellowish brown, the 6 to 8 radials acicular, spreading, about 1 cm. long; the central subulate, 2 cm. long, porrect.

Ce reus magnus Haworth, Phil. Mag. 7: 109. 1830.

This species has not been definitely identified. Haworth says it was procured from the captain of a French vessel, who obtained it from Santo Domingo. He describes it as a yard high, with 12 ribs and a very large white flower 6 inches long and open day or night. This does not correspond to any cactus known from Hispaniola. Pfeiffer suggests that it might be a form of C. eyriesii, that is an Echinopsis. In its large flower, open both day and night, it does agree with that genus.

Cereus microsphaericus Schumann (Fl. Bras. 42: 196. 1890) and C. damazioi Schumann (Monatsschr. Kakteenk. 13: 63. 1903; 28: 62. 1918) are of this alliance. Both come from near Rio de Janeiro, Brazil.

27. BORZICACTUS Riccobono, Boll. R. Ort. Bot. Palermo 8: 261. 1909.

Low, slender cacti, erect or procumbent; ribs usually numerous but sometimes as few as 9, usually low and rounded; spines acicular or in some species subulate; areoles usually approximate, in some species producing wool with the flowers; flowers diurnal, orange to scarlet (in one species said to be white) solitary, narrow; tube-proper very short, smooth within; throat very narrow below, expanded above; limb somewhat spreading; axils of scales on ovary and flower-tube bearing long silky hairs; stamens long and slender, slightly exserted; fruit small, globular, edible.

Type species: Borzicactus ventimigliae Riccobono.

This genus is perhaps nearest Rathbunia of Mexico, but is of different habit and usually with different spines. The flowers are of much the same shape, but with a different limb, some of the stamens originating near the base of the flower-tube, while the areoles of the ovary and flower bear long silky hairs.

The plants are found in the mountains and hills of Ecuador, Peru, and northern Chile, where they have a remarkable development. The indications are that there are still other species to be referred here. It was named in honor of Professor Antonio Borzi, director of the Botanical Garden of Palermo, Italy. Eight species are here described.

Key to Species.

Flowers red.

Base of throat bearing a mass of hairs within.

Ribs many, low 2

Base of throat naked within.

Flowers pinkish, not as narrow as in the next species, their areoles very hairy 3

Flowers dark red, very narrow, their areoles not very hairy 4

Flowers white 5

Not grouped 7

sepium morleyanus icosagonus acanthurus decumbens humboldtii plagiostoma aurivillus

1. Borzicactus sepium (HBK.).

Cactus sepium Humboldt, Bonpland, and Kunth, Nov. Gen. et Sp. 6: 67. 1823.

Cereus sepium De Candolle, Prodr. 3: 467. 1828.

Cleistocactus sepium Weber in Gosselin, Bull. Mens. Soc. Nice 44: 36. 1904.

Borzicactus ventimigliae Riccobono, Boll. R. Ort. Bot. Palermo 8: 262. 1909.

Cereus ventimigliae Vaupel, Monatsschr. Kakteenk. 23: 13. 1913.

Stem slender, simple, columnar, 1.5 meters high, about cm. thick; ribs 8 to 11, crenate, obtuse; areoles 1.5 to 2 cm. apart; radial spines 8 to 10, slender, spreading, 5 to 10 mm. long; central spine solitary, about 2 cm. long; spines all dark red with yellowish bases when young, gray in age; flowers somewhat zygomorphic, about 4 cm. long, 3 cm. broad; scales on ovary and flower-tube woolly in their axils; outer perianth-segments lanceolate, erect, scarlet; inner perianth-segments cuneate, red; pistil slightly exceeding the stamens; stigma-lobes 10, short, greenish; fruit globular, 2 cm. in diameter; flesh of fruit white; seeds numerous.

Type locality: Near Riobamba, at foot of Chimborazo, Ecuador.

Distribution: Dry hills along the interandean valley of Ecuador from San Antonio to Riobamba.

The plant blooms from July to September, while the flowers are said to remain open for 48 hours.

A careful examination of the description of Humboldt's Cactus sepium convinces us that it is the same as Borzicactus ventimi-gliae. Not only are the two descriptions similar, but the two types came from the high Andes of Ecuador and a plant sent by Mr. Riccobono from Palermo as B. ventimigliae is the same as one sent from the Berlin Botanical Garden as Cereus sepium. Dr. Rose, when in Ecuador in 1918, visited Riobamba, but did not see this species there; but he did find it a little north on the hills about Ambato (No. 22389). He also saw what he took to be this species between Ambato and Quito, and, again, collected the species at San Antonio, north of Quito (No. 23557).

The fruit is eaten at Ambato and doubtless elsewhere and is known as muyusa.

Figure 229 shows the top of a plant obtained by Dr. Rose from the Botanical Garden at Palermo, Italy.

2. Borzicactus morleyanus sp. nov.

Plant low, growing in clumps, prostrate or with erect branches, sometimes hanging over cliffs or ascending and leaning against rocky banks for support, 4 to 6 cm. in diameter; ribs 13 to 16, low, obtuse, divided into tubercles by V-shaped creases above the areoles; areoles circular, 1 cm. apart or less; spines numerous, 15 to 20, bristly or somewhat acicular, brown, unequal, the longer ones 2.5 cm. long; flowers narrow, 5 to 6 cm. long, slightly oblique; perianth-segments spreading, acute; stamens exserted; filaments purple above, white or tinged with pink below, erect; style cream-colored; stigma-lobes 10, cream-colored.

Very common at Sibambe, Ecuador, where it was collected by J. N. Rose and George Rose, August 29, 1918 (No. 22431, type), and above Huigra, August 28, 1918 (No. 22426).

Here may belong Dr. Rose's plant (No. 22829) from Cuenca, although it has somewhat different spines and perhaps more ribs on the stem.

It is named for Mr. Edward Morley, of Huigra, Ecuador, who greatly aided Dr. Rose in his explorations in Ecuador in 1918.

Figure 230 shows the top of a flowering stem, and figure 231 shows the type, photographed by George Rose.

3. Borzicactus icosagonus (HBK.).

Cactus icosagonus Humboldt, Bonpland, and Kunth, Nov. Gen. et Sp. 6: 67. 1823.

Cereus icosagonus De Candolle, Prodr. 3: 467. 1828.

Cereus isogonus Schumann, Gesamtb. Kakteen 102. 1897.

Cleistocactus icosagonus Weber in Gosselin, Bull. Mens. Sci. Nice 44: 34. 1904.

Fig. 229.—Top of plant of Borzicactus sepium. X0.6.

Plants small, procumbent or ascending, 2 to 6 dm. long, 3 to 5 cm. in diameter; ribs 18 to 20, low; areoles approximate; spines bright yellow, numerous, acicular, 1 cm. long or less; flower-buds covered with white wool or hairs; flowers near the end of the branches, 7 to 8 cm. long, pinkish to orange; flower-tube naked at base; perianth-segments oblong, acute, apiculate; scales on the ovary and flower bearing long white and brown hairs in their axils.

Type locality: Near Nabón, Ecuador.

Distribution: In the vicinity of Nabón, Ecuador.

This species has long been a puzzle and so far as we know the only record of its having been previously collected is that of the type at Nabón. Dr. Rose visited Nabón in 1918, where he found this species very abundant on the dry hills. Its range is very circumscribed, for it does not extend very far either north or south of Nabón. It is readily distinguished from the other species of the genus seen in Ecuador in its' very dense mass of short yellow spines and its larger lighter-colored flowers. These flowers are very attractive and it is to be hoped that some of the living material sent to New York may produce flowers. The plants, however, had to be carried for a long distance by pack train before being shipped to New York and did not arrive in very good condition. Dr. Rose's plant from Nabón was collected September 25, 1918 (No. 23029). We have tentatively referred here his plant from Tablón de Oña, collected September 27, 1918 (No. 23 130), but it has smaller flowers.

Illustration: Schumann, Gesamtb. Kakteen f. 21, as Cereus isogonus.

Gruson Greenhouses
Fig. 230.—Borzicactus morleyanus. Fig. 231.—Borzicactus morleyanus.

4. Borzicactus acanthurus (Vaupel).

Cereus acanthurus Vaupel, Bot. Jahrb. Engler 50: Beibl. 111: 13. 1913.

Plants low, spreading and procumbent, with the tips ascending, sometimes sprawling over the edge of a cliff, with long hanging branches, 1 to 3 dm. long and 2 to 4 cm. in diameter; ribs 15 to 18, very low, rounded, separated by narrow acute intervals; areoles small, approximate; flowering areoles producing tufts of white wool about the flowers; flowers scarlet; tube slender, straight or a little curved, 4 to 5 cm. long; limb about 2.,5 cm. broad; inner perianth-segments spreading, acute; filaments white below, scarlet above; style rose-colored, longer than the filaments; stigma-lobes green; fruit globular, 2 cm. in diameter.

Type locality: Matucana, Peru.

Distribution: On the low hills and in the narrow valleys near Lima and along the Rimac River to the east of Lima.

Observed June 1839 at San Cristobal near Lima by A. T. Agate, of the Wilkes' Exploring Expedition. Agate's painting of it is preserved in the Library of the Cray Herbarium.

Plate xxv, figure 3, shows a flowering plant collected at the type locality by Dr. Rose in 1914 which flowered in the New York Botanical Garden in the same year.

5. Borzicactus decumbens (Vaupel).

Cereus decumbens Vaupel, Bot. Jahrb. Engler 50: Beibl. 111: 18. 1913.

Plant cespitose, procumbent or ascending, forming small clumps; branches slender, 3 to 4 cm. in diameter; ribs numerous, 20, low, almost hidden under the spines, the intervals acute; areoles close together, about 5 mm. apart; radial spines very numerous, about 30, acicular, short, 5 to 8 mm. long, yellowish; central spines usually 5, much longer and stouter than the radials, often 2 to 3 cm. long, subulate; flower 8 cm. long, with a slender cylindric tube gradually expanded into the throat, the limb about 5 cm. broad; perianth-segments described as white, oblong to oblanceolate.

Type locality: Rocky sandy bottoms, Mollendo, Peru.

Distribution: On hills, southwestern Peru, and northwestern Chile.

The type of this species was first collected by Weberbauer in 1902 on the hills about Mollendo, and here Dr. Rose collected living and herbarium specimens in 1914. Old flowers and fruits were obtained, but no flowers have appeared on the living specimens in the New York Botanical Garden.

Three collections made by Dr. Rose in southern Peru are referred here tentatively. One is from near Arequipa, altitude about 7,000 feet, the second is from near Posco, altitude about 2,000 feet, and the third is from hills above Mollendo, altitude about 200 feet, as mentioned above. This is an unusually wide range for a species in this region. The plants themselves show considerable variation, suggesting that more than one species is involved. Until fresh flowers have been obtained it seems best to recognize only the one species.

MlMm

Fig. 233.—Flower of Borzicactus decumbens. X0.7.

Figure 232 is from a photograph taken by Dr. Rose near Arequipa, Peru, showing this plant in the foreground at the base of a ledge; figure 233 shows a flower collected by Juan Sohrens near Tacna, Chile.

Fig. 232.—Borzicactus decumbens.

6. Borzicactus humboldtii (HBK.).

Cactus humboldtii Humboldt, Bonpland, and Kunth, Nov. Gen. et Sp. 6: 66. 1823.

Cereus humboldtii De Candolle, Prodr. 3: 467. 1828.

Cleistocactus humboldtii Weber in Gosselin, Bull. Mens. Soc. Nice 44: 33. 1904.

Procumbent, cylindric; ribs 10 to 12, low, somewhat tuberculate; spines setose, rigid; flowers red, about 7 cm. long; flower-tube elongated; the scales bearing long greenish gray hairs; perianth-segments lanceolate, acute, red; filaments slender, glabrous; style much longer than the perianth.

Type locality: Between Sondorillo and San Felipe, Peru.

Distribution: Northern Peru and probably southern Ecuador.

The type locality when this species was collected by Humboldt was located in Ecuador, but it is now in northern Peru.

Dr. Rose while collecting in Ecuador in 1918 did not reach Peru, but he found in southern Ecuador near Loja and again in the Catamayo Valley a species of Borzicactus which seemed to correspond to Cactus humboldtii.

7. Borzicactus plagiostoma (Vaupel).

Cereus plagiostoma Vaupel, Bot. Jahrb. Engler 50: Beibl. 111: 20. 1913.

Columnar, erect, or suberect, about 1 meter high, attenuated and rounded at apex; ribs 15, low; areoles close together, orbicular; spines numerous, nearly black; flowers numerous, cylindric but somewhat zygomorphic; ovary bearing many small, ovate, acuminate scales with black felt in axils.

Type locality: San Miguel, Department of Cojamarca, Peru.

Distribution: Peru.

Said to resemble Cleistocactus baumannii, but the relationship is doubtless with the species which we have referred to Borzicactus. It is known to us only from description and illustrations.

Illustrations: Monatsschr. Kakteenk. 24: 165, 167, as Cereus plagiostoma.

8. Borzicactus aurivillus (Schumann). (See Appendix, p. 226.)

PUBLISHED SPECIES, PERHAPS OF THIS GENUS. Cleistocactus chotaensis Weber, Bull. Mens. Soc. Nice 44: 7. 1904.

Cereus chotaensis Vaupel, Monatsschr. Kakteenk. 23: 25. 1913.

Plant 2 meters high; flowers 5 cm. long, orange-colored; limb 2.5 cm. broad; scales on the ovary bearing long black hairs; stamens as long as the perianth-segments.

Type locality: On the Rio Chota, Peru.

According to Weber this species is similar to one of the so-called species of Cereus collected by Humboldt from this same general region.

Cereus serpens (HBK.) De Candolle, Prodr. 3: 470. 1828.

Cactus serpens Humboldt, Bonpland, and Kunth, Nov. Gen. et Sp. 6: 68. 1823.

Cleistocactus serpens Weber in Gosselin, Bull. Mens. Soc. Nice 44: 39. 1904.

Stems creeping; branches somewhat angled; areoles 6-angled, spiny; spines 1 to 3.5 cm. long; flowers tubular, 5 cm. long, flesh-colored; scales few, the upper ones spreading, glabrous; the lower ones hirsute; inner perianth-segments 8 to 12, lanceolate, acute, arranged in 2 or 3 series; stamens a little shorter than the perianth-segments; ovary ovate; stigma-lobes 8.

Type locality: Dry barren hills, banks of Rio Guancabamba, near Sondorillo, Ecuador, now Peru.

Distribution: Known only from the type locality.

This species was originally described from Bonpland's manuscript notes and no specimens are extant. The type locality is definitely given and it should be re-collected and positively identified. Kunth, who referred all of Humboldt and Bonpland's plants to Cactus, questioned its belonging to the subgenus Cereus, while De Candolle, although

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