LEGUMINOS^;. (PULSE FAMILY.) 53 



purple ; the standard orbicular. — From IT. W. Wyoming to Washington and 

 California. 



4. Ii. Lyallii, Gray. Stems from a spreading woody caudex: pubescence 

 dense, villous, appressed : leaflets obovate : racemes very short, the peduncles 

 much exceeding the leaves ; bracts short : petals purple ; the .standard elliptical. 

 — Proc. Am. Acad. vi. 334. Bitter Root Mountains, and in the Cascades of 

 Washington. 



* * Stems taller, erect or ascending, and racemes elongated. 

 ■i- Flowers large : leaflets 7 to 10, glabrous above or nearly so : ovules 5 to 8. 



5. L. Burkei, Watson. Stout, erect, the short and silky pubescence closely 

 appressed: lower leaves long-petioled ; leaflets about equalling the petioles : 

 raceme usually short and dense ; bracts villous : flowers purple or sometimes 

 white : calyx with spreading pubescence : heel nearly semicircular : pod 8-seeded. 

 •— Proc. Am. Acad. viii. 525. L. polyphyllus, of Bot. King's Exp. and Hayd. 

 Rep. 1871 and 1872. Head-waters of Yellowstone and Snake Rivers, to 

 N. Nevada. 



6. L. Sitgreavesii, Watson. Puberulent and somewhat silky villous with 

 spreading hairs : raceme open, shortly peduncled : calyx oppressed-silky : stan- 

 dard rounded, naked : ovules 5. — Proc. Am. Acad. viii. 527. In the mountains 

 from the S. Sierra Nevada to S. Colorado and New Mexico. 



7. L. Plattensis, Watson. Appressed silky-villous throughout, with a sou.e 

 what glaucous hue : leaflets spatulate : raceme loose, shortly peduncled : petals 

 pale blue, with a conspicuous darker spot upon the standard. — Proc. Am. Acad. 

 xvii. 369. L. ornatus, Dougl., var. glabratus, Watson. The L. ornatus of the 

 Hayden Reports. Common on the Upper Platte and northward. 



*- fr- Flowers smaller (3 tob lines long) : ovules 2 to 6. 

 *+ Lower petioles elongated: leaflets not glabrous above : racemes mostly dense. 



8. L. leueophyllus, Dougl. Leafy, densely silky-tomentose throughout 

 and somewhat villous : leaflets 7 to 10, oblanceolate or cuneate-oblong ; the 

 upper petioles about equalling the leaves : racemes sessile or nearly so, densely 

 flowered: pedicels stout: petals blue or pink; the standard densely villous. 

 — Head-waters of the Platte and Missouri Rivers, to Washington and N. 

 California. 



++ ♦+ Stems slender : pubescence short, silky, appressed: petioles and peduncles 

 mostly short: flowers subverticillate or scattered, on short slender pedicels. 



9. L. parviflorus, Nutt. Stems 2 or 3 feet high: pubescence scanty, tlif 

 calyx and pedicels silky: leaflets 5 to 11, oblanceolate to ohovate, glabrous almn 

 the lower leaves shorter than the petioles : standard naked. — Mountains of Centr.il 

 Colorado, to the sources of Snake River, and westward to Central California 

 and the Columbia River. 



10. L. laxiflorus, Dougl. Stems 1 to 2 feet high : leaflets 6 to 8, nar- 

 rowly oblanceolate, silky on both sides, at least half as long as the petioles : calyx 

 narrowed and saccate at base: standard somewhat pubescent. — Wasatch Moun- 

 tains, westward to N. California and Vancouver Island. 



11. L. argenteus, Pursh. Hoary with thick pubescence: stem 1 to 2 

 feet high : leaflets 5 to 8, linear-lanceolate, smooth above or nearly so, about equal- 

 ling the petioles : calyx gibbous but not spurred at base : petals blue or cream 



