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. O. résrrormis, E. & Bil’. : subprostrata ; radicibus clongato-fusi- 
formibus ; articulis orbiculatis ; pulvillis setas elongatas virescenti- 
fuscas gerentibus, plerisque vel solum superioribus armatis; aculeis 
E 2-3 gracilibus albidis deflexis seu patentibus; floribus mimoribus ; 
stigmatibus 8; bacca ovata ; seminibus majusculis subregularibus. 
Kansas and Nebraska, in the regions of the Cross-Timbers, from the 
Canadian to the Big Bend of the Missouri. — Roots elongated tubers 
4-1 inch in diameter ; joints about 3-4 inches long ; spines an inch 
or a little more in length, slenderer and paler than in O. Rafinesquii. 
Flowers 2 — 2+ inches in diameter. Seed 2? lines wide. This plant 
has been distributed by me under the name of Opuntia bulbosa. 
17. O. rusco-atra, E. in P. R. R.: diffusa; articulis orbiculato- 
obovatis tuberculatis; pulvillis subremotis magnis griseo-tomentosis, 
inferioribus solum inermibus; setis numerosis robustis longiusculis 
fuscis ; aculeis subsingulis robustis fusco-atris suberectis, altero bre- 
viore deflexo seepe adjecto; floris flavi ovario conico pulvillos 12 — 18 
. fulvo-villosos et fusco-setosos gerente ; stigmatibus 5 
ke Sterile places in prairies, west of Houston, Texas: fl. May. — The 
: stout brown, or above almost black spines, and the thick bunches of 
unusually stout brown bristles on the small joints, give this plant a 
very distinct appearance. Joints 24-3 inches long; pulvilli 6-9 
lines apart ; bristles 2-3 lines long; spines 1-1} inches long, the 
lower one, when present, about half as long, but hardly less stout. 
Flower nearly 3 inches in diameter ; ovary an inch leng, rather slen- 
es der, its pulvilli covered with long grayish- brown wool, and the upper 
| "ones with a few bright-brown bristles. 
=~ 18. O. vunearis, Mill.: diffusa, prostrata ; radice fibrosa; articulis 
obovatis seu suborbiculatis crassis late seu pallide viridibus plerumque 
| inermibus ; follis ovatis cuspidatis fere adpressis ; pulvillis subremo- 
& tis parvis subimmersis setas paucas abbreviatas virescenti-stramineas 
gerentibus ; aculeis rarissimis singulis robustis variegatis suberectis ; 
alabastro subgloboso obtuso ; ovario clavato pulvillis sub-10 stipato ; 
petalis sub-8 ; stigmatibus 5 ; bacca obovata clavata ; seminibus regu- 
laribus crassis crasse marginatis. 
, From the southeastern coast of Massachusetts to Georgia and Flor- 
ida ; apparently only in the low countries east and southeast of the 
Alleghany Mountains, generally not far from the sea-coast: fl. May and 
June. — Joints 2-4 inches long and 2-23 in diameter, rather thick 
and fleshy. Leaves 2-23 lines long, generally appressed, only in 
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