ACANTHOCERKUS. 



125 



Marshall A. Howe 



specimen collected by Dr. Rose at Laredo 



from a photograph by J. K. Small of 

 g, Buena Vista, Miami, Florida, May 



Charles 



1917 



4. Acanthocereus subinermis sp. noy. 



Plants I meter high or higher; joints stout, 5 to 7 cm. broad, strongly 3 or 4-anglcd, bright 

 green, somewhat shining, usually short; areoles 3 to 4 cm. apart; spines cither 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; arcolcs of 



ovary 



J. N. Rose betvreen Mitla and Oaxaca City, Mexico 

 has since been grown in Washington and in the ^ 



(No. 1 1 304). It 



Garden, v^here it has frequently flowered and fruited. 



Plate XVI, figure 2, represents a flowering joint of the type 

 specimen, and figure 3 shows its fruit. 



5. Acanthocereus occidentalis sp. nov. 



Stems rather weak, forming dense thickets ; branches slender, 4 

 to 5 cm. in diameter, 3 to 5 -angled, dull green, often bronzed; margins 

 of ribs slightly sinuate; areoles i to 3 cm. apart, filled with short brown 

 wool; spines numerous, nearly equal, yellowish, acicular, up to 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 



March 



Mazatlan 



1910 (No. 14752); and by Dr. Rose at.Rosario in 1897 (No. 



\ 



3170; 



This species is widely separated geographically from the 



others of this genus, being confined 

 coast of Sinaloa, western Mexico. 



thickets 



Figure 185 shows part of a joint of a plant brought by Dr. 



from Sinaloa 

 Acanthocereus 



Fig. 185. — Joint of Acanthocc 

 reus occidentalis. X0.5. 



o. Acaninocereus Diasmensis sp. nuv. i t_ t. j 



■stems weak, at first erect but soon pr6strate or t".*^""? °^"J"?,';f,^ "Xl"lT^^^^^ 



[uous spines; pulp greenish white; seeds 



Common in thickets in the subarid 



from Machado 



rved by Dr. Rose m 1915; the type is 11 um x..a...^<^^^ ^--^ v <^ - , , . 



This species not only is out of the range of the precedmg ^f^^^^^^^^^Vd^fferenf 



^ . . -^ ■!_... c^^u *.^t-trioU^r Via^ more ribs and these ot ditterent texture. 



somewhat anomalous 



much 



spines, and has a greenish white pulp. 



from 



Acanthocereus 



/- Acaninocereus ir; aiuicauuo ^^j. ^^^^^ , . .• j t, 



, 1 u ^- of r.rc:f ^ meter hieh or less, afterward elongating and arch- 

 ^ A low, weak plant, although erect ^^ first a me^er ngn ^ ^^^ ^j^^ ^ j^, ^,,1 ,li htly 



ing; branches few, usually sharply 4-angled, i to 3 cm. broaa, diuim 



t: 



