W ATSON—Plants of Bernalillo County 
mote; 3 to 6 stout radiating dark-colored spines, 3-4 to 
1 and 1-3 in. long. 
38. OPUNTIA, Tourn. 
Articulated, much branched, plants of various 
shapes, low and prostrate or erect and _ shrub-like; 
areola with numerous short easily detached bristled 
and usually stouter spines; mostly large diurual 
flowers on joints of the previous year; spreading obo- 
vate or obcordate petals. There are several of this 
genus in our locality which the anthers has not yet 
identified. 
Joints quite flat, seed with a prominent bony margin. 
Joints large, 6 in. long or more, berry ovate 
- : - - - (1) 0. camancuica, Hing. 
Joints smaller 2 and 1-2 to 3 in. in diameter, 
- - = - - (2) 0. FUSCO-ATRA. 
Joints little flattened, ovate; low, cesptose, 
sisi - - - : -.. (8) 0. FRAGIZIs. 
J ae cylindrical, peck branched (4) 0. ARBORESCENS. 
1. 0. comancuica, Hng. Prostrate and extensively 
spreading; joints ascending, suborbicular, 6 to 7 in. 
long; pulvilli remote,- mostly bearing few straw col- 
ored or fulvous bristles and 1-3 compressed grayish- 
brown spines(in some they are twisted. This may be 
O. tortispina but there are only 1-3 spines) paler at 
the tips, the upper ones suberect elongated, the rest 
deflexed 1 and 1-2 to 3.in. long. Mesa. 
2. o. Fusco-aTra, Hng. Diffuse; joints orbiculate- 
ovate, tuberculate, pulvini somewhat remote, large, 
grayish, tomentose, only the lower armed; bristles 
numerous, stout, rather long (1 and 1-2 to 2 and 1-2 
in.) grayish-brown; spines usually a single stout brown- 
ish-black, suberect one (1 to 1 and 1-2 in. long) often 
another shorter deflexed one; flowers yellow, nearly 3 
in. in diameter with a conical ovary bearing pulvilli 
eovered with long grayish-brown wool. Lower slopes 
of the mountains. 
3. o. FRAGILIS, Haw. (The Frigile O. ) Joints 
small, 1 to 1 1-2 in. long; larger spines 4, cruciate, 
mostly yellowish-brown with 4 to 6 smaller white radi- 
ating ones below; bristles few; flowers yellow; fruit 
with 20 to 28 clusters of bristles, only the upper ones 
with a few short spines. Very common on the mesa 
forming patches several feet across. The most com- 
mon of our mesa cacti. 
(50) 
