134 ThS cactaceae. 



Figure 191 is from a photograph taken by Dr. Rose near Comanche, Bolivia, in 1914; 

 figure 193 shows a flower and figure 194 a fruit collected by Dr. Shafer near Andalgala, 

 Argentina, in 19 16. 



Fig. 193. — Flower of T. Fig. 194. — Fruit of T. 

 pasacana. X0.6. pasacana. X0.6. 



6. Trichocereus bridgesii (Salm-Dyck). 



Cereus bridgesii Salm-Dyck, Cact. Hort. Dyck. 1849. 208. 1850. 



Cereus lagenaejormis Forster, Hamb. Gartenz. 17: 164. 1861. 



Cereus bridgesii brevispinus Schumann, Gesamtb. Kakteen 108. 1897. 



Cereus bridgesii lageniformis Schumann, Gesamtb. Kakteen 108. 1897. 



Cereus bridgesii longispinus Maass, Monatsschr. Kakteenk. 15: 119. 1905. 



Cereus lasianthus Schumann in Rusby, Bull. N. Y. Bot. Gard. 4: 365. 1907, as hyponym. 



Tall, 2 to 5 meters high, more or less branching, pale green, a little glaucous ; branches 1 to 1 .5 

 dm. in diameter, 4 to 8-ribbed; ribs obtuse, separated by broad but shallow intervals; areoles large, 

 about 2 cm. apart; spines 2 to 6, yellowish, acicular to subulate, very unequal, sometimes 10 cm. 

 long, not swollen at base; flowers large, 18 cm. long; flower-tube 5 to 6 cm. long; throat broad; inner 

 perianth-segments oblong, perhaps white, 5 to 6 cm. long; scales on ovary and flower- tube small, 

 sometimes only 3 to 4 mm. long, scattered, bearing numerous hairs in their axils; fruit scaly, long- 

 hairy, 5 to 6 cm. long. 



Type locality: Not cited. 



Distribution: About L,a Paz, Bolivia, where it is frequently grown as a hedge plant or 

 placed on the tops of walls for the protection of gardens. 



Mr. Juan Sohrens reports a similar plant from northern Chile which may belong here, 

 or it may be the little-known Cereus arequipensis . 



The origin of this species is unknown, but since it was named for Bridges, who collected 

 in Bolivia, it is probable that it came from that country. Dr. Rose's specimens from Bolivia 

 (No. 18842) closely resemble living plants so named from European collections, now rep- 

 resented in the New York Botanical Garden, so that we have no hesitancy in referring 

 them here. 



7. Trichocereus pachanoi sp. nov. 



Plants tall, 3 to 6 meters high, with numerous strict branches, slightly glaucous when young, 

 dark green in age; ribs 6 to 8, broad at base, obtuse, with a deep horizontal depression above the 

 areole; spines often wanting, when present few, 3 to 7, unequal, the longest 1 to 2 cm. long, dark 



