38 
§ 3. Settspine: adscendentes: articuli plerumque minores: aculei 
pauci, teretes seu vix angulati, graciles, flexiles, pallidi: bacca 
minor 
13. O. renvtsPina, E. in B. C. R.: articulis majusculis obovatis 
basi attenuatis lete viridibus; pulvillis subapproximatis setas graciles 
breves fulvas gerentibus plerisque armatis; aculeis 1—2 elongatis 
‘albidis cum 1-4 brevioribus inferioribus ; floris flavi ovario clavato ; 
petalis obovatis retusis ; bacca oblonga profunde umbilicata ; semini- 
bus minoribus. 
Sand-hills near El Paso : fl. May. — Joints 3-6 inches long, 2-4 
wide ; leaves very slender, hardly 2 lines long; upper spines sub- 
erect, or spreading, 14 — 24 inches long ; flower 24 - 3 inches in diam- 
eter; seeds less than 2 lines in diameter, very irregular. — Similar 
in many respects to O. pheacantha, which grows with it ; but readily 
distinguished by the spines and fruit. 
fo ey 4, O. setispina, E. in Salm, H. D.: articulis suborbiculatis par- 
vp fee» Vis glaucis ; pulvillis confertis setas flavidas gerentibus, omnibus arma- 
tis; aculeis 1-3 longioribus subangulatis et 3-7 brevioribus plus 
td OE 
24 
LM ore 
Se 0 mings. deflexis, omnibus gracillimis. 
a a on 
| cola: *’ Pine woods in the mountains west of Chihuahua, Dr. Wislizenus. 
6. Gg; Joints not over 2.inches long; pulvilli only 3-4 lines apart; longer 
spines 1-13 inches long, very slender, like bristles. Flower and 
tow 
fruit unknown. 
15. O. FinipENDULA, E. in B. C. R.: glauca; radicibus nodoso- 
incrassatis ; articulis minoribus orbiculatis seu obovatis seu oblance- 
olatis tenuibus ; pulvillis approximatis setas virescenti-flavas graciles 
numerosas gerentibus armatis vel inermibus ; aculeis, si adsunt, 1-2 
elongatis subangulatis cum 1-2 minoribus, omnibus albidis ; floris 
purpurascentis ovario gracili; stigmatibus 5; seminibus minoribus 
tumidis. 
Alluvial bottoms of the Rio Grande near El Paso, and eastward on 
the Pecos: fl. May and June.— The long knotted roots, the small 
bluish joints, with the very small leaves and very long bristles, to- 
gether with the purple flower, and thick very narrowly margined 
seeds, distinguish this species from all others. Plant 6-12 inches 
high, joints 14-3 inches long, 1-2 wide ; pulvilli 4-6 lines apart; | 
lower spines 1-2 inches long. Flower 23 inches in diameter. Seed 
hardly 2 lines in diameter. 
63h. fh. 0: Ree Cera’ LO 26 aa = 
1% 
