436 
Terr.), the Upper Pecos (New Mex.), and Utah (throughout the Salt 
Lake Basin and the foothills of the Wahsatech). 
Specimens examined: MONTANA (Canby 140 of 1883): COLORADO 
(Farwell 1062): New MEXx1c0 (Bigelow of 1853, on the Upper Pecos, 
type of rufispina). 
The extreme polymorphism of this species has resulted in a maze of bewildering 
forms impossible to classify. The form known as rufispina (Cactus feror Nutt.) is the 
typical one, as described above and as illustrated by the specimens cited above, In 
addition to the five rather distinet varieties described below there is a large number 
of what may be called miscellaneous forms, not exactly typical, but not departing 
from the type sufficiently to be set apart as varieties. These miscellaneous forms, so 
far as examined, are as follows: 
WASHINGTON (Lyall of 1860; Suksdorf 314): OnEGON (Cusick 1389; Spalding, at 
Clearwater): MONTANA ( Hayden 1854 and 1859): Soutit DAKOTA (Hayden 1853 and 
1855): NEBRASKA ( Hayden of 1855; Rydberg of 1891, Phelps and Deuel Cos.): NEVADA 
(Watson of 1869; Coville § Funston 1981): Uran (Palmer 4): Cororapo (Hall & 
Harbour 68, 183; Hall of 1862; Greene 36 of 1873; Jones 504): INDIAN TERRITORY 
(Hall of 1869, Canadian River): New Mexico (Bigelow of 1853; Rothrock 6 of 1874, 
Santa Fe): also cult. in Hort. Salm-Dyck. 1847; in Harv. Bot, Gard. 1871; growing 
in Mo. Bot. Gard. 1893. 
51. Opuntia polyacantha platycarpa (Engelm.). 
Opuntia missouriensis platycarpa Engelm. Syn. Cact. 300 (1856). 
Joints elongated-obovate to obovate-orbicular, 7.5 to 12.5 em. long: 
pulvini 12 to 18 mm. apart, with few straw-colored bristles, the lower 
ones sometimes unarmed, or upper with few spines (sometimes 
only 6 to 12 mm. long), or with exterior spines, as in the species, and 
mostly one stout spreading or detlexed reddish-brown interior one: 
fruit depressed-globose, with a remarkably large and flat umbilicus, 
16 to 18 mm, long. (JIL. Pacif. R. Rep. iv, t. 14, f£ 4)—Type, the 
Hayden specimens of 1853-54 from Nebraska and Montana in Herb. 
Mo. Bot. Gard. 
In the Upper Missouri region, from Idaho and Montana to Utah, 
Colorado, and Nebraska. 
Specimens examined: IDAHO (MacDougal 280): MonTANA (Hayden 
of 1854): Uran ( Watson 434 of 1869, Parley’s Park; Hayden of 1871; 
Ward 187, 443): CoLorano (Parry of 1869): NEBRASKA (Hayden of 
1853-54), 
52. Opuntia polyacantha borealis, nom. nov. 
Opuntia missouriensis microsperma Engelm. & Bigel. Pacif. R. Rep. iv, 46 
(1856), not mesacantha microsperma Engelm. 
Joints and spines as in platyearpa: fruit ovate, with depressed umbil- 
icus, shortly spiny: seeds smaller, 4 mm. broad, with narrow and acute 
margin. (Il. Pacif. R. Rep. iv, t. 14, f. 5-7; t. 24, f. 1, 2)-—Type, the “ Fur 
traders” specimens of 1847 in Herb. Mo. Bot. Gard. 
From British Columbia to Oregon and South Dakota. 
Specimens examined: British CoLumBrIA (Macoun 5): OREGON 
(Drake & Dickson of 1889): SourH Dakora (“Fur traders” of 1847; 
Hayden): also cult. in St. Louis Gard. 1847. 
