443 
rangular or rarely compressed, stouter, spreading, 3.5 to 5 em. long; 
exterior ones 4 to 6 and much smaller: flowers yellow, 5 em. broad: 
fruit ovate, very spiny: seed beakless, 5 to 5.5 mm. in diameter, with 
indistinct linear commissure. (J//. Cact. Mex. Bound. t. 72)—Type, 
Wright specimens of 1851 in Herb. Mo. Bot. Gard. 
Sandy bottoms of the Rio Grande near El Paso, Texas, and dewn- 
ward. 
Specimens examined: TEXAs ( Wright 10, 40, 539, of 1851; Evans of 
1891; HL. A. Mearns of 1892, El] Paso). 
67. Opuntia emoryi Engelm. Syn. Cact. 303 (1856). 
Prostrate and spreading, 15 to 45 em. high: joints cylindrical with 
clavate base, glaucous, ascending and curved, 10 to 15 em. long and 
2.5 to 3.5 em, in diameter, with oblong-linear elongated (2.5 to 3.5 em.) 
closely approximated tubercles: pulvini with few rigid bristles: spines 
very numerous, pitted or roughened, reddish-black or brown, at length 
ashy; interior ones 5 to 9, stouter, triangular, compressed, porrect or 
deflexed (upper ones only suberect), 5.> to 6 cm. long, 1.5 to 2 mm. 
broad; exterior ones 10 to 20, in many series, radiating in every direc- 
tion, the exterior gradually smaller and less angular, the upper slen- 
derer and teretish, the lower more rigid and compressed: flowers yellow, 
reddish without, 5 to 6 em, broad: fruit ovate, clavate at base, yellow, 
very bristly and spiny, 5 to 6 em. long: seeds irregular, 4.5 to 6.5 mm. 
in diameter, with mostly an indistinct transverse commissure. (Jl, 
Cact. Mex. Bound. t. 70-71)-—-Type, specimens of Wright and Bigelow 
in Herb. Mo. Bot. Gard. 
Arid soil, from the Ki Paso region of Texas westward into Arizona 
and southward into Chihuahua and Sonora. 
Specimensexamined: TExas (EHvans of 1991): New MExIco ( Wright 
& Bigelow, at Copper Mines; G@. Rk. Vasey of 1881, Socorro): ARIZONA 
(Schott 8 of 1758): CHIHUAHUA (Bigelow 45 of 1852), 
68. Opuntia schottii Engelm. Syn. Cact. 304 (1856). 
Prostrate, with short-clavate ascending joints 5 em. long and bear- 
ing elongated tubercles 16 to 18 mm. long: pulvini with few bristles: 
spines very scabrous, reddish (broader ones with white margin); inte- 
rior about 4, cruciate, 3.5 to 5 em. long; upper triangular and erect, the 
rest plane above and convex beneath, the lower broader; exterior 8 to 
10, slender and radiant, very unequal, 8 to 18 mm. long: fruit obovate- 
clavate, somewhat spiny: seeds beaked, angular, 4 mm. in diameter, 
with linear, indistinct commissure. (/1/. Cact. Mex. Bound. t. 73, f. 
1-4)—Type, specimens of Schott and Wright in Herb. Mo. Bot. Gard. 
On arid hills, between the San Pedro and Pecos, Texas. 
Specimens examined: TEXAS ( Wright of 1849; Schott 853; Weber of 
1866). 
Distinguished by its broad and very reneh dirty-red spines and scanty bristles. 
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