OP ARTS AND SCIENCES. 7 



serto. — Sims, Rot. Mng. t. 2148; Lindl. Bot. Rgs. t. 1054; both 

 good figures- 0. Lamherti, sericea, Plattensis, & Hookeriann, Nutt. 

 ill Torr. & Gray, Fl. i. 339, 340. — Plains of the Saskatchewan and 

 IMiimesota to W. Texas and New Mexico, west to Montana, British 

 Columbia, Utah, &c. The yellowish-flowered and the purple or violet 

 forms often growing side by side. 



Var, SERICEA ( 0. sericea, Nutt. in Torr. & Gray, 1. c.) is some- 

 times well marked, as a robust form, with broader leaflets (from lance- 

 olate to oblong, and 3 or 4 lines wide), and cylindraceous legumes 

 nearly or quite an inch long ; the pubescence of the leaflets very silky : 

 but these characters very variable. It abounds from the mountains of 

 Wyoming to those of Texas and Arizona, and to the eastern borders 

 of California. A form with slender legumes passes into 



Var. BiGELOVii. Legumes distinctly stipitate in the calyx, slender 

 (an inch long, including the style, only 2 lines in diameter), minutely 

 puberulent under a lens, very thin-coriaceous : leaves narrow, green 

 and glabrate. — 0. Lamberti, Torr. in Pacif. R. Rep. iv. 80. — On 

 the Upper Canadian River, in Colorado? Bigelow. 



§ 3. Acaulescens; stipulis petiolo adnatis; scapis spicigeris : folia verti- 

 cillato-pinnata, nempe foliolis pluribus quasi in fasciculis sen verticillis 

 ordinatis. — § Verticillares, DC. 



16. O. SPLEXDENS, Dongl. in Hook. Fl. Bor.-=Am. i, 147, cum 

 var. vestita & var. Richardsonii (0. oxyphylla, Richards, nou PalL). 

 Nitenti- (stepius argenteo-) sericeo-villosa : legumine ovato sutura dor- 

 sali parum ventraii longe introflexa bilocellato calyce villosissimo longe 

 augusteque 5-dentato demum hinc fisso fere incluso. — Subarctic Brit- 

 ish America to the Rocky Mountains, from Montana to Colorado 

 and northern part of New Mexico. The specimens of Richardson, in 

 which, according to Sir William Hooker, the fruit greatly exceeds the 

 calyx in length, should be re-examined. In all ours the legume is as 

 described above: and the beak of the keel is not so very short as 

 Buuge describes it. 



