tion. Joints 4 — 6 inches long, curved, 1 — lJr inches in diameter; 
tubercles 1-1J inches long; longest spines inches long, 
— 1 line wide; the exterior spines gradually smaller, and less angu¬ 
lar. Fruit 2-2J inches long, partly armed with spines 4-8 lines 
long. Seeds from 2J- to 3£ lines in diameter. Cotyledons oblique 
or accumbent. 
32. O. Schottii, E. L c.: articulis clavatis; tuberculis elongatis ; 
71 A. jy. 
pulvillis pauci-setosis; aculeis rubellis scaberrimis, interioribus sub-4 
cruciatis, superiore triangulato, cseteris supra planis subtus convexis, 
latioribus; exterioribus 8—10 radiantibus gracilibus; bacca ovata 
pulvillos 35 - 40 pauci-setosos gerente ; seminibus rostratis. 
On the arid hills near the mouth of the San Pedro and Pecos, 
Western Texas. —- Distinguished by the broad and very rough spines, 
which are dirty red, the larger ones with a white margin, and by 
the smaller number of bristles both on the pulvilli of the joints and of 
the fruit, where they are mostly turned upwards. Joints 2 inches 
long; tubercles 8-9 lines long; spines 1J-2 inches long; the 
radiating ones only 4-9 lines long. Seeds 2 lines in diameter. 
Cotyledons oblique. 
Dr. Gregg has collected a similar plant near San Luis Potosi; 
which at present I know not how to distinguish from O. Schottii. 
The spines are stout, perhaps less rough, and narrower, 12 - 15 in 
number; some of them borne on the upper margin of the pulvillus, 
which I have never seen in O. Schottii . Tubercles an inch long. 
33. O. Grahami, E. 1. c.: radicibus fusiformibus; articulis clava¬ 
tis ; tuberculis oblongis ; foliis ovatis cuspidatis; setis demum pluri- 
mis; aculeis gracilibus rubellis, interioribus 4-7 teretiusculis angu- 
latisve, exterioribus 4-6 brevibus; bacca pulvillos sub-30 setosissi- 
mos gerente ; seminibus erostratis. 
Sandy bottoms of the Rio Grande'near El Paso: fl. June. —Joints 
1J-2 inches long; tubercles 6-7 lines long; leaves thicker and in 
proportion shorter than in most other species, nearly 2 lines long. 
Fruit similar to that of O. clavata. Seed 2J lines in diameter or 
more. Cotyledons regularly incumbent. 
34. O. bttlbispina, E. 1. c.: radicibus fusiformibus; articulis par¬ 
vis ovatis ssepe ex apice proliferis fragilibus; tuberculis ovatis brevi¬ 
bus ; pulvillis parce setosis ; aculeis teretiusculis scabrellis basi bul- 
bosis, interioribus 4 cruciatis, inferiore, longiore, exterioribus 8 - 12 
radiantibus. 
m 
0 1 
cm 
7 8 9 10 Missouri 
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