442 
64. Opuntia clavata Engelm. Wisliz. Rep. 11 (1848). 
Low cespitose plant, forming dense spreading level-topped masses 6 
to 12 dm, in diameter and with ascending branches: joints shortly 
clavate, bright-green, 2.5 to 7.5 em. long and 2.5 cm. thick, with ovate 
tubercles 12 to 16 mm. Tong, and subulate leaves 4 to 5 mm, long: pul- 
vini large and closely approximate, with white rigid bristles: spines 
white and scabrous; interior 4 to 7, flattened, 12 to 30 mm. long, the 
upper one triangular and erect, the lower ones broader (broadest 3 mm.), 
striate above and keeled below, deflexed; exterior 6 to 12, more slender, 
4 to 16 mm. long, radiating in every direction: flowers yellow, 5 em. 
broad: fruit elongate-clavate, deeply wmbilicate, lemon-yellow, 3.5 to 4 
em. long and 2.5 em, in diameter, almost covered with white slender 
radiating bristles: seeds beaked, 5 to 6 mm. in diameter, with impressed 
linear commissure. (J/l, Pacif. R. Rep. iv, t. 22, f. 1-3; t. 24, £6: Caet 
Mex. Bound. t. 73, f.5,6)—Type, Wislizenus and Fendler specimens of 
1846 and 1847 in Herb. Mo. Bot. Gard. 
In the region about Albuquerque and Santa Fe, New Mexico; also 
in southern Nevada, and presumably to be found in adjacent Utah and 
Arizona. 
Specimens examined: NEw MEXx1Ico ( Wislizenus of 1846, near Albu- 
querque; Fendler 275 of 1846 and 1847, near Santa Fe; Bigelow of 1853; 
Rothrock 92, Kl Rito; Vasey 173): Nev ADA (Coville & Funston 430), 
65. Opuntia pulchella Engelm. Trans. St. Louis Acad. ii, 201 (1863). 
Small, cespitose, 7.5 to 25 em. high, the main stem erect: joints 
obovate-clavate, lightly tuberculate, 2.5 to 7.5 em. long: pulvini 
crowded: upper spines from white to nearly black, straight, 8 to 36 mm. 
long, a single one longer, flattened, porrect or detlexed); the others 
radiant and very short (1 to3 mm.): flowers bright purplish-red or 
deep rose-red, 3 to 3.5 em, broad: fruit clavate, about 2.5 em. long, 
with numerous flexible not barbed bristles: seeds thick and round, 
4 mm. in diameter, with broad, flat commissure.—Type, H. Engelmann 
of 1859 in Herb. Mo. Bot. Gard. 
Western and southern Nevada and adjacent Arizona; presumably 
in southeastern California. 
Specimens examined: NEVADA (H. Engelmann of 1859, Walker River; 
Gabb of 1867, Walker River; Watson 438, Monitor Valley; Lieut. 
Wheeler of 1872; Lemmon 943; Shockley 319): ARIZONA (Bischoffof 1871). 
Remarkable in this group for its purple flowers. 
++ Spines long (2.5 to 6 cm.). 
66. Opuntia grahami Engelm. Syn. Cact. 304 (1856). 
Prostrate, with thick fusiform roots: joints short-clavate, bright- 
green, ascending, 3.5 to 5 cm. long, with oblong tubercles 12 to 14 mm, 
long: leaves ovate, 4 mm. long: pulvini with white wool, and bristles at 
length very numerous, elongated and rigid: spines slender, scabrous, 
reddish, at length ashy brown; interior ones 4 to 7, teretish or quad- 
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