PEA FAMILY 481 



lanceolate, 2-3 cm. long, grayish strigose and strongly veined; stem-leaves re- 

 duced to small lance-subulate scales, 3^ mm. long; flowers in interrupted spikes 

 terminating the branches; calyx canescent; upper teeth rounded, the lower three 

 broadly triangular; corolla dark blue, 5 mm. long; pod subglobose, 4 mm, thick, 

 canescent. In sand: se Utah. 



2, P. lanceolata Pursh. Stem very glandular-pxmctate, glabrous or spar- 

 ingly strigose, 1.5-^ dm. high; leaflets 1.5^ cm. long, strigose with scattered 

 hairs or glabrate; peduncles 1-3 cm. long; calyx-tube 1.5 mm. long, campanulate; 

 lobes ovate, obtuse, 0.5 mm. long; corolla 5-6 mm. long; pod 4 mm. thick. Sandy 

 'plains : Sask. — Kans. — N.M. — Ariz. — Mont. Plain — SuhmonL My-Au. 



3, P. micrantha A. Gray. Stem very glandular-dotted, glabrous or strigose; 

 leaflets 1-5 cm. long, 1-3 mm. wide, glabrous or nearly so; peduncles 2^ cm. 

 long; calyx-tube 1 mm. long; lobes rounded-oval, 0.5 mm. long; corolla scarcely 

 5 mm. long. Sandy plains: Okla. — Tex. — Ariz. — s Utah. Son, Ap-JI. 



4, P. Purshii Vail. Stems adsurgent, branched, sparingly strigose or gla- 

 brate, 1-6 dm. high; leaflets 1.5-4 cm. long, retuse, rounded or acute, and mucro- 

 nate, sparingly strigose or glabrate; peduncles 2-5 cm. long; cal>^ and corolla as 

 in P. lanceolata; pod 4-5 mm, thick, Sandy soil: "Wash. — Ida. — Ariz. — Calif. 

 Son, — Submont. My-S. 



6. P. steuostachys E>ydb. Stem adsurgent or erect, sparingly strigose and 

 glandular-dotted, 3-5 dm. high, branched; leaflets 2—4 cm. long, rounded to acute 

 and mucronate at the apex, sparingly strigose; peduncles 5-15 cm. long; calyx- 

 tube 1.5 mm. long; teeth 0.5 mm. long; corolla white, 4 mm. long. Sandy soil: 

 Utah. Son. Jl. 



6. P. stenophylla Rydb. Stem simple, about 5 dm. high, slender, sparingly 

 strigose and glandular-dotted; leaflets 2.5-5 cm. long, about 2 mm. wide, spar- 

 ingly strigose; peduncle 8-10 cm. long; calyx-lobes triangular, acute, 0.5 mm. 

 long; corolla about 4 mm. long. Sandy river banks: Utah. Son, Je-Jl. 



7. P. tenuiflora Pursh. Stems erect, diffusely branched, striate and stri- 

 gose; leaflets 1-4 cm. long, glabrous above, strigose beneath; racemes slender, 

 2-10 cm. long, rather few-flowered; calyx strigose, usually purplish; tube 1.5 mm. 

 long; calyx-lobes lanceolate, 1 mm. long, acute; corolla light blue, 4^5 mm. long; 

 pod ovoid, 8 mm. long. Prairies and plains: S.D. — Tex. — Ariz. — Mont. Plain 

 — SuhmonL Je-0. 



8. P. llnearifolia T. & G. Stem 4-10 dm. high, widely branching, sparingly 

 strigose; leaflets 2-6 cm. long, 2-3 mm. wide, sparingly strigose beneath, glabrous 

 above; calyx-tube campanulate, 2-2.5 mm. long; teeth lanceolate, acute, 1-1.5 

 mm. long; corolla blue, 7-8 mm. long; pod ovoid, 8 mm. long. Plains and hifls: 

 Neb.— Ark.— Tex.— Colo. Plain, Je-S, 



9. P. collina Rydb. Stem 4-6 dm. high, branched, strigose; leaflets oblong- 

 oblanceolate, obtuse, 1.5-2.5 cm, long, glabrous or nearly so above, grayish 

 strigose beneath; bracts lanceolate, 2-4 mm, long; caljTc densely silky-strigose; 

 tube and the lanceolate lobes each 2 mm. long; corolla blue, about 6 m m . long. 

 Hills: w Neb. Plain, JL 



10. P. argophylla Pursh. Stem erect, 3-6 dm. high, branched above, 

 strigose-canescent; leaflets 1.5-4 cm. long, &-20 mm. wide, obovate or oval, 

 obtuse, densely white-silky on both sides, or grayish strigose above; spike rather 

 short; calyx silvery; tube about 2 mm. long; upper teeth 2-3 mm. long, lanceolate, 

 the lower one narrower, 6 mm. long, in fruit over 1 cm. long. Prairies and plains: 

 Sask. — Wis. — Mo. — N.M. — Alta. Plain, Je-Au. 



11. P. digitata Nutt. Stem erect, simple below, branched above, canescent, 

 3-6 dm. high; leaflets 2-3.5 cm. long, 3-5 mm. wide, densely strigose-canescent 

 beneath, sparingly strigose when young, soon glabrate above; spike lax- bracts 

 5 mm. long; cal>Tc silky; tube in flowers 3-4 mm. long; lobes lanceolate, abruptly 

 acuminate, the upper 2 mm., the lowest one 4 mm. long; corolla 7-8 mm. long, 

 blue; pod ovoid, 6-7 mm. long. P. cainpestris Nutt. Sandy plains: S.D. — 

 Ark.— Tex.— Colo. Plain, My-JL 



