ANCISTROCACTUS. 5 



mm. long or less, white to straw-colored; central spines 3 or 4, the lowest one strongly hooked; 

 flowers small, 2.5 cm. long, greenish yellow; ovary small, nearly naked; seeds large (about 2 mm, 

 long), brown and minutely tuberculate (according to Coulter). 



Type locality: Not cited. 



Distribution: Southern Texas and northern Mexico. 



It is probable that this species is based on Potts's specimen from Chihuahua and, if 

 so, may be a different species from the one described by Kngelmann, which he said was 

 "a most elegant little species, one and a half to two inches high; larger spines black and 

 white variegated." We have not seen Potts's plant, but it was referred here by Hemsley. 



Illustrations: Cact. Mex. Bound, pi. 17; Riimpler, Sukkulenten f. 105; Cact. Journ. 

 i: pi. for March; Schelle, Handb. Kakteenk. 156. f. 84, as Echinocactus scheeri. 



Plate II, figure 2, shows a plant collected by Dr. Rose at I/aredo, Texas, in 19 13, which 

 flowered in the New York Botanical Garden in 19 14. Text-figure 2 is from a photograph 

 taken by Robert Runyon of a plant collected in 192 1 near Brownsville, Texas. 



-Ancistrocactus scheeri. 



Fig. 3. — Ancistrocactus brevihamatus. 



3. Ancistrocactus brevihamatus (Engelmann). 



Echinocactus brevihamatus Engelmann, Proc. Amer. Acad. 3: 271. 1856. 

 Echinocactus scheeri brevihamatus Weber in Schumann, Gesamtb. Kakteen 336. 1898. 



Globular to obovoid, 5 to 10 cm. high, 5 to 7.5 cm. in diameter, dark green; ribs usually 13, 

 compressed, strongly tubercled; tubercles grooved on upper side from spine-cluster to base, the 

 groove woolly; radial spines 10 to 14, terete, white, 10 to 20 mm. long; central spines 4, the lower 

 one porrect, hooked at apex; flowers rose-colored, 25 to 32 mm. long, not so broad as long; inner 

 perianth-segments 15 mm. long, 4 mm. broad; mid-rib darker colored than margins; fruit about 1.5 

 cm. long, thin-walled, nearly naked; seeds brownish black, about 2 mm. long, smooth or with low 

 flattened papillae, with a deep-set basal hilum. 



Type locality: On the San Pedros, Texas. 



Distribution: Southern Texas. 



Illustrations: Haage and Schmidt, Haupt-Verz. Cact. 1908: 226; Schelle, Handb. 

 Kakteenk. 157. f. 85, as Echinocactus scheeri brevihamatus; Cact. Mex. Bound, pi. 18, 19; 

 Ann. Rep. Smiths. Inst. 1908: pi. 3, f. 3; Forster, Handb. Cact. ed. 2. 516. f. 64; Riimpler, 

 Sukkulenten 186. f. 104; Blanc, Cacti 41. No. 414; Engler and Prantl, Pfl[anzenfam. 3*^: 

 162. f. 56, c, as Echinocactus brevihamatus. 



Text-figure 3 is a reproduction of plate 18 of the Cactaceae of the Mexican Boundary 

 Survey. 



