TRICHOOSKEUS. 



135 



yellow to brown; flower-buds pointed; flowers very large, 19 to 23 cm. long, borne near the top of 

 branches, night-blooming, very fragrant; outer perianth-segments brownish red; inner perianth- 

 segments oblong, white; filaments long, weak, greenish; style greenish below, white above; stigma- 

 lobes linear, yellowish; ovary covered with black curled hairs; axils of scales on flower-tube and fruit 

 bearing long black hairs. 



Collected by J. N. Rose, A. Pachano, and George Rose at Cuenca, Ecuador, September 

 17 to 24, 1918 (No. 22806, type). 



This species is widely cultivated throughout the Andean region of Ecuador, where it is 

 grown both as an ornamental and as a hedge plant. In some of the lateral valleys on the 

 western slope of the Andes it appears to be native, as for instance above Alausi, but as it 

 has doubtless long been cultivated it is impossible to be sure of its natural habitat. 



It is known to the Ecuadoreans as agua-colla or giganton and has been passing in Ecua- 

 dor under the names of Cereus peruvianas and Cereus giganteus. It is named for Professor 

 Abelardo Pachano of the Quinta Normal at Ambato, Ecuador, who accompanied Dr. Rose 

 in 191 8 on his travels in the high Andes of Ecuador. 



Fig. 196. — Trichocereus pachanoi. 



This species belongs to the high Andes, ranging from 2,000 to 3,000 meters in altitude. 

 In the Chanchan Valley it certainly comes down to about 2,000 meters and overlaps the 

 upper range of Lemaireocereus godingianus, which differs from it greatly in habit and flowers. 

 Different as the two plants are, Richard Spruce, keen botanist as he was, confused them, 

 as the following quotation will show; the part in italics refers to the Lemaireocereus: 



"The brown hill-sides began to be diversified by an arborescent Cactus, with polygonal stems 

 and white dahlia-like flowers, ■which, Briareus-like, threw wide into the air its hundred rude arms. 

 Lower down, at about 6,000 feet, I saw specimens full 30 feel high and 18 inches in diameter." 



Figure 196 shows the top of a large plant growing on the sides of a cliff on the outskirts 

 of Cuenca, Ecuador, photographed by George Rose in September 19 18. 



