48 
tion. Joints 4—6 inches long, curved, 1 - 14 inches in diameter ; 
tubercles 1-14 inches long; longest spines 11-2} inches long, 
3—] line wide; the exterior spines gradually smaller, and less angu- 
lar. Fruit 2-23 inches long, partly armed with spines 4-8 lines 
long. Seeds from 2} to 3} lines in diameter. Cotyledons oblique 
or accumbent. 
32. O. Scuottu, E. |. c.: articulis clavatis; tuberculis. elongatis ; 
pulvillis pauci-setosis ; aculeis rubellis scaberrimis, interioribus sub-4 
cruciatis, superiore triangulato, ceteris supra planis subtus convexis, 
latioribus ; exterioribus 8—10 radiantibus gracilibus; bacca ovata 
pulvillos 35 - 40 pauci-setosos gerente ; seminibus rostratis. 
n 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 14-2 inches long; the 
radiating ones only 4-9 lines Jong. 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. Granamt, 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 
14-2 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 2} lines in Emad or 
more. Cotyledons regularly incumbent. 
. 34. O. Bunpispina, E. 1. c.: radicibus fusiformibus; articulis par- 
vis ovatis sepe 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. 
