148 SYNOPSIS OF THE CACTACE OF THE UNITED STATES. 
scaberrimis, interioribus sub-4 cruciatis, superiore triangulato, czeteris supra planis subtus convexis, latioribus ; 
exterioribus 8-10 radiantibus gracilibus; bacca ovata pulvillos 35-40 pauci-setosos gerente ; seminibus rostratis. 
the arid hills near the mouth of the San ‘fae and Pecos, western Texas. — Tianeitisied 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 13-2 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 0. 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 0. Schottvi. Tubercles an inch long. 
33. O. Granami, E. 1. c.: radicibus fusiformibus ; articulis clavatis ; tuberculis oblongis ; foliis ovatis cuspi- 
datis; setis demum ietaae aculeis gracilibus rubellis, interioribus 4-7 teretiusculis angulatisve, exterioribus 
brevibus; bacca pulvillos sub-30 setosissimos gerente ; seminibus erostratis. 
Sandy bottoms of the Rio Grande near El Paso: flowers June. — Joints 14-2 inches long; tubercles 6-7 lines 
ya ; leaves thicker and in proportion shorter than in most other species, nearly 2 lines long. Fruit similar to that 
of O. clavata. Seed 24 lines in diameter or more. Cotyledons regularly incumbent. 
34. O. BULBISPINA, E. ]. c.: radicibus fusiformibus ; articulis parvis ovatis seepe ex apice proliferis fragilibus ; 
tuberculis ovatis brevibus ; pulvillis te setosis ; aculeis teretiusculis scabrellis basi bulbosis, interioribus 4 cruciatis, 
inferiore longiore, exterioribus 8-12 radiantib 
Saltillo, Mexico. — Spreading masses soa joints an inch long or less ; tubercles 4-6 lines long; interior [305] 
spines 4-6, exterior ones 1}-3 lines long. Apparently near the South American O. pusilla, Salm, and perhaps 
belonging to the Opuntia glomerate rather than here. Fruit unknown. 
§ 2. CyLINDRIC&: adscendentes vel erecte : articuli longiores, ovato-cylindrici seu elongati: textura lignos acompacta, 
tubum reticulatum vel truncum compactum formans: flores magni seu pary i, purpurei vel raro flavi: bacca sicca 
vel subcarnosa, floris rudimenta plerumque dejiciens, aculeata seu inermis. 
* Polyacanthe: lignum plerumque reticulato-tubulosum : articuli crassiores distincte tuberculati: aculei plures seu 
plurimi: flores pleramque rubri: semina inmarginata. 
t Humiliores: diffuse ramose : articuli subclavati: flores plerumque flavidi: bacex sicce, aculeate. 
35. O. Davisu, E. & B. in P. R. Rep.: caule dense lignoso ramosissimo divaricato ; articulis junioribus erectis 
elongatis basi attenuatis ; tuberculis oblongo-linearibus ; aculeis interioribus 4-7 subtriangularibus rufis vagina 
straminea laxa indusiatis divergentibus ; aculeis inferioribus 5-6 gracilibus ; bacca ovata pulvillis sub-25 aculeigeris 
stipata. 
On the Llano Estacado, near the upper Canadian River ; common. — Spreading and somewhat procumbent, 
about 18 inches high ; the only one in this section with dense wood. Joints 4-6 inches long, rather slender ; tubercles 
7-8 lines long. Interior spines 1-1} inches in length; lower ones 3-6 lines long. Fruits (all sterile, and perhaps not 
properly developed) an inch or more in length. 
36. O. ecHINocaRPA, E. & B. 1. ¢.: erectiuscula ; ramis numerosis emp Pon articulis ovatis basi clavatis ; 
berculis ovatis confertis ; aculeis majoribus sub-4 albidis ramineo-vaginatis, 8-16 minoribus undique radiantibus ; 
ra flavo (?); bacca globosa Ny seu. hemispherica ‘<c profundeque umbilicata ‘pulvillis sub-40 aculeatissimis 
ipata; seminibus late commissura 
Var. B. Masor : elatior ; ioala elongatis ; aculeis longioribus laxius vaginatis ene baccis globosis 
pulvillos panciores (25) gerentibus, 
n the valley of the lower Colorado; 8. in Sonora. — Var. a. is a low shrub, 6-18 inches high; joints [306] 
1-2} inches long ; tubercles 4-5 lines long; spines not over an inch in length. Flower apparently yellow, 
about on inches in diameter and somewhat persistent on the fruit. Fruit very shallow, saucer-shaped, with few large 
seeds. Var. 8. is 4 or 5 feet high ; joints 8-10 inches long; interior spines 1-1? long. Fruit globose, or even ovate, 
with 25 pulvilli. Seeds the same in both, 
37. O. SERPENTINA, E. in Sillim. Journ. 1852: erectiuscula seu subprostrata ; articulis elongatis eylindricis ; 
tuberculis ovatis ; aculeis 7-9 albido- seu oo ; flore flavo extus rubello; bacca subhemispheerica late et 
profunde umbilicata osa aculeatissim: 
Near the sea-coast about San Diego, California. — Sometimes 4-5 feet high, but often prostrate ; joints 
6-12 inches long; spines less than an inch long. Flower cup-shaped, 1} inch wide. Fruit apparently like that of the 
last species, but: “long woolly” and with fewer pulvilli, also often crowned with the persistent flower. Seed unknown; 
