Plants 1 meter high or higher; joints stout, 5 to 7 cm. broad, strongly 3 or 4-angled, bright green, somewhat shining, usually short; areoles 3 to 4 cm. apart; spines either wanting or short, when present 6 to 10 at an areole, acicular, usually less than 1.5 cm. long; flowers various in size, 15 to 22 cm. long; outer perianth-segments narrow, reddish, acute; inner perianth-segments white; areoles of ovary and flower-tube somewhat spiny; fruit globular to short-oblong, 4 cm. long, dull red.
Collected by J. N. Rose between Mitla and Oaxaca City, Mexico, September 6, 1908 (No. 11304). It has since been grown in Washington and in the New York Botanical Garden, where it has frequently flowered and fruited.
Plate xvi, figure 2, represents a flowering joint of the type ww/
specimen, and figure 3 shows its fruit. 1 ¿SM^r
5. Acanthocereus occidentalis sp. nov. /S
Stems rather weak, forming dense thickets; branches slender, 4 to ¡B
5 cm. in diameter, 3 to 5-angled, dull green, often bronzed; margins tjg.
of ribs slightly sinuate; areoles 1 to 3 cm. apart, filled with short brown wool; spines numerous, nearly equal, yellowish, acicular, up to _ g
7 cm. long; flowers 14 to 18 cm. long; fruit unknown.
Common on the western coast of Mexico, where it was frequently collected by Rose, Standley, and Russell at the fol- /[¡ft lowing places: San Bias, Sinaloa, March 24, 1910 (No. 13431, \ '4 [|||
type); Mazatlan, April 4, 1910 (No. 14050); Guadalupe, April T^M® ■ . 18, 1910 (No. 14752); and by Dr. Rose at Rosario in 1897
This species is widely separated geographically from the V^^pSe" w others of this genus, being confined to low thickets along the ""3OI jp ffei-.
Figure i8<; shows part of a joint of a plant brought by Dr.
„ y c. , . r J r a J Fig. 185.—Joint of Acanthoce-
Rose from Sinaloa in 1910. reus occidentalis. X0.5.
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