ORKOeiCKIvl'S. 



Distribution: Arid parts of Bahia and 

 Piauhy, Brazil. 



Plate xxv, figure 4, shows the flowering 

 top of a plant obtained by Dr. Rose near 

 Joazeiro, Brazil, in 191 5, which flowered soon 

 afterward in the New York Botanical Garden ; 

 plate xxvii, figure 1, shows a fruiting branch 

 of a plant collected by Dr. Rose near Salgada, 

 Bahia, in 1915. 



2. Arrojadoa penicillata (Giirke). 



Cereus penicillatus Giirke, Monatsschr. Kak- 

 teenk. 18: 70. 1908. 



Plant slender, 1 to 2 meters high, much 

 branched, often bushy, the branches 1 to 1.5 cm. 

 in diameter; ribs usually 10, low; areoles small, 

 close together; spines several; radial spines short, 

 spreading; central spines longer, often 2 to 3 cm. 

 long; pseudocephalium at the top of the joint 

 2 to 3 cm. in diameter, made up of long brown 

 bristles and white wool ; flowers 6 to 20 in a cluster, 

 dark pink, 3 cm. long; fruit small, a little longer 

 than broad, 1.5 cm. long, smooth, without scales, 

 purplish, juicy; seeds numerous, black. 



Type locality: Calderao, Bahia, Brazil. 



Distribution: State of Bahia, Brazil. 



Figure 243 is from a photograph taken 

 by Paul G. Russell at Machado Portella, 

 Bahia, in 1915. 



Fig. 243. — Arrojadoa penicillata. 



32. OREOCEREUS (Berger) Riccobono, Boll. R. Ort. Bot. Palermo 8: 258. 1909. 



Plants forming large clusters, usually low, erect, ascending or even prostrate, without a 

 cephalium, but the areoles developing long white hairs, especially toward the tips of old branches, 

 the stout stems and branches strongly ribbed; ribs strongly armed with spines; flowers slender, 

 elongated, somewhat curved, diurnal; tube nearly cylindric, slightly expanded upward, the limb 

 short, spreading, somewhat oblique, the inner perianth-segments dark red, narrow; filaments 

 numerous, slender, exserted, attached all over the throat; anthers narrow, red; style long, exserted, 

 with short green stigma-lobes; ovary and flower-tube bearing small narrow scales, with long black 

 and white hairs in their axils; fruit globular, spineless, dry, dehiscing (like Echi no cactus) by a basal 

 opening; seeds numerous, dull black, with a large truncated hilum. 



The name is from the Greek, signifying mountain-cereus. The genus is monotypic, in 

 so far as known to us. The following species inhabits the Andes: 



1. Oreocereus celsianus (Lemaire) Riccobono, Boll. R. Ort. Palermo 8: 259. 1909. 



Pilocerens celsianus Lemaire in Salm-Dyck, Cact. Hort. Dyck. 1S49. 185. 1850. 



Pilocereus fossulatus Labouret, Rev. Hort. IV. 4: 24. 1855. 



Pilocereus bruennowii Haage in Forster, Handb. Cact. ed. 2. 651. 1885. 



Pilocereus jossulatus gracilis Riimpler in Forster, Handb. Cact. ed. 2. 661. 1885. 



Pilocereus fossulatus pilosior Riimpler in Forster, Handb. Cact. ed. 2. 661. 1885. 

 ^Pilocereus kanzleri Haage in Forster, Handb. Cact. ed. 2. 671. 1885. 



Pilocereus celsianus lanuginosior Salm-Dyck in Schumann, Gesamtb. Kaktccn 180. 1897. 



Pilocereus celsianus gracilior Schumann, Gesamtb. Kakteen 180. 1897. 



Pilocereus celsianus williamsii Schumann, Gesamtb. Kakteen 180. 1897. 



Pilocereus celsianus bruennowii Schumann, Gesamtb. Kakteen 180. 1897. 



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



Cereus celsianus Berger, Rep. Mo. Bot. Gard. 16: 64. 1905. 

 }Pilacereus straussii Heese, Gartenflora 56: 410. 1907. 

 ICereus straussii Vaupel, Monatsschr. Kakteenk. 23: 37. 1913. 



Oreocereus celsianus bruennowii Britton and Rose, Stand. Cycl. Hort. Bailey 4: 2404. 1916. 



