OPUNTIA. 



197 



hairs or flexuous spmes, some of which are from 3 to 6 inches long, and I have some extra 

 fine specimens with the spines or hairs 9 and 12 inches long." 



Illustrations: Alverson, Cact. Cat. 9 as Opuntia ursina; Pac. R. Rep. 4: pi. 13, f. 

 8 to II ; pi. 24, f. 4. 



Figure 242 is from a photograph of the plant taken by F. B. Headley at a point about 

 29 miles east of Fallon, Nevada, in 19 10. 



220. Opuntia juniperina sp. nov. 



Somewhat of the habit of Opuntia polyacantha, but not so procumbent, stouter, and with fewer 

 and stouter spines; joints obovate, 10 to 12 cm. long, broad, rounded at top; areoles small, all below 

 the middle of the joint naked, the upper ones each bearing one stout spine and i to several very 

 short accessory ones ; the longer spine very stout, 3 to 4 cm. long, brown ; flowers not known ; fruit 

 dry, oblong, 3 cm. long, spineless, with a shallow, flat umbilicus; seeds large, irregular, 6 to 8 mm. 

 broad. 



Fig. 243. — Joint of Opuntia juni- 

 perina. X0.5. 



Fig. 244. — Seed 

 of same. X0.5. 



Fig. 245. — Opuntia hystr 

 X0.5. 



On dry hills among junipers in vicinity of Cedar Hill, San Juan County, New Mexico, 

 altitude about 1,900 meters, August 17, 1911, Paul C. Standley (No. 8051). 



This species is nearest Opuntia rhodantha, but has stouter joints and much larger seeds. 

 Figure 243 represents a joint of the type specimen; figure 244 represents a seed. 



221. Opuntia hystricina Engelmann and Bigelow, Proc. Amer. Acad. 3: 299. 1856. 



More or less diffuse ; joints obovate to orbicular, 8 to 20 cm. long; areoles numerous, 10 to 15 mm. 

 apart, rather large; spines numerous, pale brown to white, the longer ones 5 to 10 cm. long, stout, 

 flattish, often reflexed; glochids yellow; flowers 6 cm. long; petals broad, yellow; ovary nearly glob- 

 ular; fruit oblong to obovoid, 2.5 to 3 cm. long, spiny above, dry, with a compressed umbilicus; seeds 

 7 mm. broad. 



Type locality: Colorado Chiquito and on San Francisco Mountains. 



Distribution: New Mexico to Arizona and Nevada. 



Although this species has a wide range, it is not very well understood ; it approaches 

 0. rhodantha in some of its forms. We have referred here a very remarkable form collected 

 by B. W. Nelson at Lee's Ferry, Arizona, in 1909. This plant has thick, obovate joints 17 



