HARRISIA. 155 



Illustrations: Monatsschr. Kakteenk. 14: 89. f. b; Rep. Mo. Bot. Card. 16: pi. 9, f. i ; 

 U. S. Dept. Agr. Bur. PI. Ind. Bull. 262: pi. 7, all as Cerens tortiwsus. 



Plate xxi, figure i, 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). 



Cerei/s 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, i cm. long; central spine solitary, i 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. 



Ccreus bonplandii pomanensis Weber (Schumann, Gesamtb. Kakteen 137. 1897) is 

 given as a synonym of this species. C. pomanensis grossei (Graebener, Monatsschr. Kak- 

 teenk. 19: 137. 1909) is only a mentioned name. 



Illustrations: Rep. Mo. Bot. Gard. i6:pl. 7, f. 5, 6, both as Ccreus 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. 

 Eriocerens martinii Riccobono, Boll. R. Ort. Bot. Palermo 8: 241. 1909. 

 Cereus martinii perviridis 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 monacanthits 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 Pilocercus 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. I 9 I )- 



Illustrations: Amer. Gard. n: 569; Cycl. Amer. Hort. Bailey i: f. 304 (both fruits 

 spineless) ; Rep. Mo. Bot. Gard. 16: pi. 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 (Giirke). 



Cereus adscendens Giirke, 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; 



