2C) Proceedings of the Biologic(d. Soaetg of Washington. 
The (leHcription was <lrawii in July, Wi:}, from specimens grown under 
cnltivation, tlu; (lescri])tions made in tlie iield having been lost. I he 
type hears my collection Mo. 9747, and was collected in the region C)f 
Oaxaca, iMexico, in August, 1909. 
Opuntia sanguinocula sj). nov. 
A low, hemispherical, or usually more flattened shrnh, 25 to 40 cm. high, 
and spreading 1 meter or more, main arms resting on ground on edge 
or ascending and secondary ones erect from them; joints broadly to nar¬ 
rowly ohovate and sometimes nearly suhcircidai-, some of last year’s 9 by 
25 cm., others 8 by 10 cm., mature growth of this year (i by 8 to 8 by 12 
cm., slightly glaucous, gray-green, slightly raised at areoles for a couple 
of years; areoles ohovate, brown, 2 mm. long, eidarging to snixdrcular, 
and :’) to 4 mm. in diameter in age; leaves comj)aratively large, 12 mm. 
in length, subulate, cuspidate; spicules brown, turning dirty j^ellow, in a 
compact tuft in center of areole, completely surrounded by a zone of 
wool, 2 mm. long, in age tilling the areole entirely and becoming 3 to 4 
mm. in length; spines white, 1 to 3, mostly 1 or 2, contined to uppcu- 
and marginal areoles of the joint, erect, diverging or in age, the second 
especially sloi)ing down, 15 to 25 mm. long, slightly ilattened, twisted, 
with bone-like tijis; flowers lemon yellow with bright deep red glossy 
centers, filaments yellow distally and greenish, i)roximally, stigma white, 
()-parted, (i to 7 cm. in diameter when fully opened; fruit light ])inkish 
red, and at this place often persisting to sec(jnd year and bleaching again 
to greenish yellow, always greenish within. 
The type is jjreserveil under my inventory No. 9359, and was grown 
from plants secured near Taylor, Texas, in July, 1908. The description 
was drawn from cultivated plants at Chico, (5difornia, July, 191:!. 
Opuntia riparia sp. nov. 
An erect, hemispherical, open branched shi-ub, 150 to 175 cm. high, 
and having a spread of 2 or nion^ m. ; joints long, ohovah^, sharply to 
broadly rounded abov(‘, glaucous, about 15 by 23 cm.; areoles large, 
obovate on sides but subcircular on edges of joints and often 8 mm. in 
diamehu’, brown, not raised; spicules 1 cm. long, in a spreading nne(pial 
tuft on edges and shorUu- on sides of joints, light brown; spines whit(', 
often but not always colonxl at very base, 2 to 3 cm. long, v('ry stout, 
Ilattened, twisted, 2 to 3 on sidi^s and :! to (i on edges of joints, the upper 
central erect, the otln'rs spreading or sloping downward; flowers yellow, 
deeper yellow within, tilaments orange, style white, stigma very large, 
deep green, 10 to 11 parted, 10cm. in diameter when fully opened; fruit 
red with j)nri)lish ting(‘. 
Frequent along upper foothills’ conrst^s of dry washes in the Santa 
Rita Momdains, Arizona. Collected Ai)ril, 1908, and grown in cnltivation 
since that date. 
