142 SYNOPSIS OF THE CACTACEZ OF THE UNITED STATES. 
The following may be considered as a subspecies : — 
O. occipENTALIS, E. & B. in P. R. R.: erecta, patulo-ramosissima ; articulis grandibus obovatis vel rhomboideis ; 
pulvillis remotis setas graciles confertas et aculeos 1-3 validos compressos deflexos albidos basi obscuriores et inferiores 
ae graciliores gerentibus ; floris flaviintus rubelli ovario obovato ; bacca obovata late umbilicata ; seminibus 
On the western slope of the California mountains, near San Diego and Los Angeles: flowers June. — Plant 
4 feet high, forming large thickets ; the joints 9-12 inches long; palvalli with very fine closely-set bristles ; spines 
about an inch Iong. Apparently distinct from O. Engelmanni by its manner of growth, the very fine bristles, and the 
larger Said 
are also some indications of another form, growing on hills and plains near San Diego, California, and on 
the sce sea-beach, with higher and more upright growth, and coarser bristles on the pulvilli, but which I 
cannot well distinguish from 0. Engelmanni. I have seen no fruit or seed of i 
O. cutorotica, E. & B. in P. R. R.: caule erecto Ae flavis numerosissimis fasciculatis armato; articulis 
orbiculato-obovatis. pallicis ; pulvllis subremotis setas difformes confertas aculeosque 3-6 inequales compressos 
stramineos gerentibus; floris flavi ovario pulvillis confertis tle petalis spathulatis. 
Western olorado country, between New Mexico and California, from the San Francisco mountains to 
Mojave Creek. — Plant 4—6 feet high, forming large and sometimes spreading bushes ; the trunk covered with [292] 
spines 1-2 inches long; joints 8-10 by 6-8 inches in length; spines $-14 inches long. Ovary with nearly 
50 pulvilli, while the foregoing species have not more than 20 
+ ¢ Procumbentes. 
7. O. procumbens, E. & B. 1. c.: prostrata ; articulis orbiculato-obovatis grandibus pallide viridibus; pulvillis 
remotis setas stramiueas rigidas valde ineequales et aculeos 2-4 validos compressos angulatos stramineos basi obscuriores 
gerentibus. 
rancisco mountains to Cactus Pass, in western New Mexico. Joints 9-13 inches long, always edgewise ; 
pulvilli 14-2 inches apart; spines 1-2 inches long. Similar to 0. Engelmannt, but prostrate, with more distant 
pulvilli and stouter spines. No flower or fruit seen. 
8. O. ancustata, E. & B. 1. c.: prostrata vel adscendens ; articulis elongato-obovatis versus basin angustatis ; 
pulvillis remotis setas fulvas graciles aculeosque paucos (2-3) validos compressos stramineos seu albidos versus basin 
rufos a gerentibus ; bacca obovata tuberculata ; seminibus magnis. 
uni, west of the Rio Grande, westward to the Cajon Pass, in the California mountains. — Joints 
6-10 sachs long, only 3 or 4 wide. Spines similar to those of the last species ; bristles much more delicate. Fruit 
13 inches long ; the umbilicus flat, but immersed. — Well distinguished by the shape of the joints. 
a * * Fulvispine. 
9. ©. MacrocEnTRA, E. in B.C. R.: adscendens; articulis magnis suborbiculatis tenuibus ; pulvillis subremotis 
setas graciles breves fulvas gerentibus, summis solum aculeos 1-2 prelongos subcompressos fusco-atros proferentibus ; 
floris flavi ovario ovato ; stigmatibus 8 ; seminibus majusculis. 
Sand-hills on the Bio Grande near El Paso: flowers May. — Two or three feet high, with very striking round 
joints, 5-8 inches in diameter, and blackish spines as much as 2 or 3 inches long. Nearly allied to the next species. 
... 10. O, PHa#acanTHa, E, in Plant. Fendl.: diffusa, ilecindante: ; articulis obovatis crassis glaucescentibus ; ; 
pulvillis subremotis setas graciles stramineas seu fuscatas longiores gerentibus, plerisque aculeos 2-5 plus minus 
compressos fuscos proferentibus ; floris flavi ovario abbreviato ; stigmatibus 8; bacca cuneata pyriformi; seminibus 
majusculis, 
Var. a. NIGRICANS : aculeis brevioribus acute angulatis et nigricantibus. [293] 
Var. 8. BRUNNEA: pulvillis remotioribus ; aculeis longioribus obtuse engpulatie brunneis sursum albidis. 
ar. y- MAJOR: suborbiculata; p remotis; aculeis brevioribus paucioribus pallidioribus. 
New Mexico: flowers May. Var. a. is found on the Rio Grande near Santa Fé; @. in similar sandy locations 
near El Paso ; and y. in mountainous regions near Santa Fé. — Joints 4-6, or in y. even 8 inches long; spines mostly 
1-2 inches in length. Flower about 2 inches in diameter, with a short ovary. Fruit 1}-1} inches long, slender, 
much contracted at base so as to appear almost stipitate. 
O. Mosavensis, E. & B. in P. R. R.: prostrata; articulis grandibus suborbiculatis; pulvillis remotis ; setis 
fulvis ; aculeis 3-6 validis infra fuscis. 
On the Mojave, west of the Colorado. — The material is too scanty to make out where it belongs ; but perhaps it 
is only a form of O. pheacantha. 
