36 
covered with 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. 
: t+ Procumbentes. 
7. O. procumBENs, E. & B. 1. c.: prostrata; articulis orbiculato- 
obovatis grandibus pallide viridibus ; pulvillis remotis setas stramineas 
rigidas valde inzequales et aculeos 2-4 validos compressos angulatos 
stramineos basi obscuriores gerentibus. 
San Francisco mountains to Cactus Pass, in Western New Mex- 
ico. Joints 9-18 inches long, always edgewise; pulvilli 14-2 
inches apart; spines 1-2 inches long. Similar to O. Engelmanni, 
but prostrate, with more distant pulvilli, and stouter spines. No 
flower or fruit seen. 
8. O. ancustata, E. & B.1. ¢.: prostrata vel adscendens ; articulis 
elongato-oboyatis versus basin angustatis ; pulvillis remotis setas ful- 
vas graciles aculeosque paucos (2 —3) validos compressos stramineos 
seu albidos versus basin rufos deflexos gerentibus; bacca obovata 
tuberculata ; seminibus magnis. 
From Zuni, west of the Rio Grande, westward to the Cajon Pass, in 
the California mountains. — Joints 6-10 inches long, only 3 or 4 
wide, Spines similar to those of the last species; bristles much more 
delicate. Fruit 14 inches long; the umbilicus flat, but immersed. — 
Well distinguished by the shape of the joints. ’ 
*« * *« Fulvispine. 
9. O. macrocenTRA, E. in B. C. R.: adscendens; articulis magnis 
suborbiculatis tenuibus ; pulvillis subremotis setas graciles breves ful- 
vas gerentibus, summis solum aculeos 1-2 prelongos subcompres- 
sos fusco-atros proferentibus; floris flavi ovario ovato; stigmatibus 
8; seminibus majusculis. 
Sand-hills on the Rio Grande near El Paso: fl. May. — Two or 
three feet high, with very striking round joints, 5-8 inches in diame- 
ter, and blackish spines as much as 2 or 3 inches long. Nearly allied 
to the next species. 
10. O. pHmacanTHA, E. in Pl. Fendl.: diffusa, adscendens ; articu- 
lis obovatis crassis glaucescentibus ; pulvillis subremotis setas graciles 
stramineas seu fuscatas longiores gerentibus, plerisque aculeos 2-5 
us minus compressos fuscos proferentibus ; floris flavi ovario abbre- 
viato ; stigmatibus 8 ; bacca cuneata pyriformi ; seminibus majusculis. 
