OF ARTS AND SCIENCES. 



297 



O. FusiFORMis, E. & B. 1. c. : subprostrata ; radicibus elongato-fusi- 

 formibus ; articulis orbiculatis ; pulvillis setas elongatas virescenti- 

 fuscas gerentibus, plerisque vel solum superioribus armatis ; aculeis 

 2-3 gracilibus albidis deflexis seu patentibus ; floribus minoribus ; 

 stigmatibus 8; bacca ovata ; seminibus majusculis subregularibus. 



Kansas and Nebraska, in the regions of the Cross-Timbers, from the 

 Canadian to the Bio; Bend of the Missouri. — Roots elono-ated tubers 

 ^ - 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. Rajinesquii. 

 Flowers 2-2^ inches in diameter. Seed 2£ lines wide. This plant 

 has been distributed by me under the name of Opuntia hulbosa. 



17. O. Fusco-ATRA, E. in P. E.. 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 ssepe adjecto ; floris flavi ovario conico pulvillos 12 - 18 

 fulvo-villosos et fusco-setosos gerente ; stigmatibus 5. 



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 2^-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 long, rather slen- 

 der, its pulvilli covered with long grayish-brown wool, and the upper 

 ones with a few bright-brown bristles. 



18. O. VULGARIS, Mill. : diffusa, prostrata ; radice fibrosa ; articulis 

 obovatis seu suborbiculatis crassis Isete seu pallida viridibus plerumque 

 inermibus ; foliis 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 - 2^ in diameter, rather thick 

 and fleshy. Leaves 2-2^ lines long, generally appressed, only in 



VOL. III. 38 



