437 
53. Opuntia polyacantha albispina (Engelm. and Bigel.), 
Opuntia missouriensis albispina Engelm. and Bigel. Pacif. R. Rep. iv, 46 (1856). 
Joints broadly obovate: bristies straw-colored: spines 6 to 12, all 
ivory-white and more slender, 2.5 to 3 cm. long, the outer 6 to 10 seta- 
ceous, the inner (in upper pulvini) 1 to 3 stouter, elongated, deflexed 
or spreading: flowers 7.5 to 8.5 em. broad: fruit ovate, with very shal- 
low umbilicus: seeds irregular, with broad and acutish margin, 6 to 7 
mm. broad. (Ill, Pacif. R. Rep. iv, t. 14, f. 8-10; t. 23, f. 18)—Type, 
Bigelow of 1853 in Herb. Mo, Bot. Gard. 
“Sandy mountains, near Albuquerque,” New Mexico, is the original 
station; reported also from western Utah, and now found in Indian 
Territory. 
Specimens examined: NEw MEx1co (Bigelow of 1853): INDIAN TER- 
RITORY (J. A. Carleton of 1891). 
The Carleton specimens seem certainly to represent this lost variety, which will 
doubtless be recognized over a wide area, but which may not stand as a worthy 
variety. 
54. Opuntia polyacantha watsoni, var. nov. 
Joints smaller, creeping, orbicular, 5 cm. broad: pulvini much 
crowded (6 to 8 mm. apart), bearing darker bristles: spines all dark; 
outer 3 or four from the lower edge of the pulvinus (sometimes 1 or 2 
added above) setaceous, 4 to 5 mm. long; inner 1 to 3 stouter, much 
longer (10 to 36 mm), deflexed (except on margin of joint): stigmas 10: 
fruit clavate, 2.5 to 3 cm. long, strongly tuberculate and cristate, deeply 
umbilicate, with few spines: seeds with broad margin and prominently 
notched at hilum.—Type, specimens cited below in Herb. Mo. Bot. Gard. 
From Nebraska and Wyoming to Colorado, Utah, and New Mexico. 
Specimens examined: NEBRASKA (Hayden of 1853): WYOMING (no 
collector recorded, at Alden): CoLorapo (French of 1874): UTAH 
(Watson 435 of 1869, Wahsateh Mts.): New Mexico (fendler of 
1846-47, near Santa Ie). 
55. Opuntia polyacantha trichophora (Engelm.). 
Opuntia missouriensis trichophora Engelm. Syn. Cact. 300 (1856). 
Joints ovate: pulvini crowded, with straw-colored at length whitish, 
bristles, all armed: spines 10 to 18, white, setiform and capillary flex- 
uous (in old joints very numerous, 15 to 25); the outer 8 to 12 shorter 
and radiant, the inner longer and deflexed, rarely a single suberect 
one: fruit ovate, 20 mm. long by 14 mm. broad: seeds very large (7 
mm.), strongly compressed, broadly and acutely margined. (/(/. Pacif. 
R. Rep. iv, t. 15, f. 1-4; t. 23, f. 19)—Type, Bigelow of 1853 in Herb. 
Mo. Bot. Gard. 
New Mexico (about Santa Fe and Albuquerque) and Texas (in the 
E] Paso region); on volcanic rocks. 
Specimens examined: NEw MEx1co (Bigelow of 1853; G. R. Vasey of 
1881, Socorro): TEXAS (Trelease of 1892): also growing in Mo, Bot. 
Gard. 1893. 
