454 
with straw-colored or yellowish sheaths, laterally divergent, the lowest 
one stoutest and detlexed: flower salverform, dull brick-red, 3.5 em. 
broad.—Type, Thurber 373 in Herb. Mo. Bot. Gard. 
‘* Near Bacuachi, Sonora.” 
Specimens examined: Sonora (Z'hurber 373), 
94. Opuntia acanthocarpa Engelm. Syn. Cact, 308 (1856). 
Erect and arborescent, stout, 15 to 18 dm, high, with reticulate wood, 
and few alternate (never verticillate) ascending divarieate branches: 
joints cylindrical, 10 to 20 em. long, 2.5 em. in diameter, with oblong: 
linear tubercles 18 to 20 mm, long: pulvini with short wool and scanty 
bristles: spines 8 to 25, stellate-porreet in every direction, with straw- 
colored or brownish sheaths, the inner (1 to 7) 2.5 to 3 em. long, the 
outer (6 to 20) 8 to 20 mm, long: flowers copper-color and small: fruit 
depressed-subglobose, broadly umbilicate, tuberculate, with rather few 
but stout spines, 2.5 cm. long: seeds sharply angular, 5 to 6mm. broad, 
with broad commissure. (Ill. Pacif. R. Rep. iv, t. 18, f.1-3; t. 24, f. 11: 
N. Am. Fauna, no. vii, t. 7, 8)—Type, Bigelow of 1854 in Herb. Mo. Bot. 
Gard. 
From southwestern Utah and southern Nevada southward through 
Arizona and southeastern California into Sonora. 
Specimens examined: ARIZONA (Bigelow of 1854; Palmer (numerous 
numbers) of 1867; Engelmann & Palmer; Rusby 622 of 1883, Peach 
Spring; Smart 245; Toumey of 1892, Tucson): CALIFORNIA (Coville 
& Funston 1943, Death Valley Eixped.): Sonora (Thurber 4, near 
“Bacuacha”): also growing in Mo. Bot. Gard., 1893, 
Among Toumey’s specimens is one with spineless fruit, but evidently this species. 
In such a case the flowers and seeds are necessary to separate it trom arborescens. 
+ + IWood dense: joints slender, obscurely tuberculate: spines single (or 1 or 2 smaller 
ones added above): seeds more or less margined, 
95. Opuntia kleiniz DC. Rev. Cact. 118 (1828), 
Opuntia wrightii Engelm. Syn. Cact. 308 (1856). 
Erect and shrubby, 6 to 12 dm. high, 2.5 to 3.5 em. in diameter below, 
with few ascending branches: joints cylindrical, slender, 8 mm. in 
diameter, with elongated depressed tubercles 14 to 18 mm. long, and 
elongated subulate spreading leaves 10 mmm, long: pulvini with white 
wool and very slender penicillate bristles: the single spine (rarely 1 or 2 
smaller divergent ones added above) porrect or a little deflexed, 16 to 
20 min. long, reddish to ashy, with straw-colored deciduous sheaths: 
flowers brick-red, 2.5 to 3 em. broad: fruit obovate, about 1.5 em. long.— 
Type unknown. 
From the Pecos region of Texas to El Paso, and southward through 
Coahuila and Sonora to southern Mexico. 
Specimens examined: TEXAS (Wright of 1851 and 1852; Parry 49; 
Evans of 1891): CoamutLa (Palmer 376): also cult. in Mo, Bot. Gard. 
1862 and 1881, and growing in 1893. 
