LEGUMINOS^E. (PULSE FAMILY.) 71 



B-flowered : flowers only 4 or 5 lines long, apparently purple : pod hardly inch 

 long, oblong-ovate, cinereous-pubescent, not at all stipitate, the ventral suture moder- 

 ately introflexed. Proc. Am. Acad. xx. 3. A species of S. California and 

 Utah, collected on Aquarius Plateau, Utah, by L. F. Ward; probably to 

 be found within our southwestern boundaries. 



w- -H. Pod oblong or narrower, not bladdery -inflated, coriaceous, nearly or quite 

 ^.-celled : scape 1 to 3-flowered. 



8. O. Parryi, Gray. Silky-canescent : leaves and scapes about a span 

 high : leaflets 7 to 9 pairs, oblong-lanceolate (2 or 3 lines long) : calvx short, 

 cinereous-pubescent : pod nearly inch long, terete with a strong ventral 

 groove, grayish-pubescent, not at all stipitate. Proc. Am. Acad. xx. 4. 

 0. arctica of Hall & Harbour's collection, no. 143. 0. Uralensis, var. pumila, 

 of Western Reports. Mountains of Colorado near the limit of trees. 



H. -M. -w. Pod nearly terete, turgid, but not bladder y-membranaceous, not stipitate or 



rarely obscurely so : scape capitately or spicately several to many-flowered. 



= More or less glandular viscid, at least the calyx and commonly the pod, 



9. O. Viscida, Nutt. Leaflets numerous and small (2 to 4 lines long), 

 thickish, oval or oblong, often pubescent when young, at maturity green and 

 glabrate : flowers in a dense oblong head or at length in a short spike, less 

 than ^ inch long : calyx villous and with sessile glands usually evident : pod 

 small (3 to 5 lines long), puberuleut, oblong, thin-chartaceous, half 2 celled, 

 the small beak or point straight. Torr. & Gray, Fl. i. 341. In the mountains 

 from British America to Colorado ; common in Wyoming. 



= = Not glandular nor viscid : leaves more or less silky at least when young. 



10. O. monticola, Gray. Loosely silky-villous, at least the scapes (5 to 

 9 inches high) and calyx: leaflets sometimes glabrate, oblong or lanceolate 

 (3 to 7 lines long) : spike oblong or cylindraceous, dense even in fruit : flower 

 hardly \ inch long : pod ovate-oblong, between membranaceous and chartaceous, 

 i to inch long, tipped with a straight point, one-celled with no introflexiou 

 of the ventral suture, or nearly half 2-celled, silfcy-canescent. Proc. Am. 

 Acad. xx. 6. 0. campestris of Hook. Fl. Bor. Am. in part. Mountains of 

 Wyoming, Dakota, and northward. 



11. O. Lamberti, Pursh. Commonly taller as well as larger (the scapes 

 often a foot or more high), silky- and mostly silvery-pubescent, sometimes 

 glabrate in age : leaflets from oblong-lanceolate to linear (4 to 16 lines long) : 

 spike sometimes short-oblong and densely flowered at least when young, often 

 elongated and sparsely flowered : flowers mostly large (often an inch long, but 

 sometimes much smaller), variously colored : pod either narrowly or broadly 

 oblong, sericeous pubescent, flrm-coriaceous, -J inch or more long, imperfectly 

 2-celled. Includes 0. campestris of Hook. Fl. Bor. Am. in part. Common 

 along the Great Plains from the Saskatchewan and Minnesota to New Mexico, 

 Texas, etc., and in the foothills. 



Var. sericea, Gray, is a robust mountain form, canescent with the silky 

 pubescence; the leaflets mostly broad (3 or 4 lines), and the cylindraceous 

 pods nearly or quite an inch long. 0. sericea, Nutt. in Torr. & Gray, Fl. i. 339. 



Var. Bigelovii, Gray, is a marked form, with pods of the preceding 

 form, but more slender, of thinner texture, and short-stipitate ; leaflets green 



