PEA FAMILY 469 



silky; lower lip lanceolate, 6 mm. long, the upper somewhat shorter and broader; 

 corolla purplish, 8 mm. long; legumes about 1 cm. long, 4-seeded. L. aridus 

 utahensis S. Wats. Mountain sides: Utah — Wyo. — Colo. Submont. Jl-Au. 



74. L. Cusickii S. Wats. Stems densely strigose, 5-8 cm. long; leaflets 5-8, 

 oblanceolate, densely canescent on both sides, 0.5-2 cm. long; racemes 2-3 cm. 

 long; bracts subulate, about equalling the buds; calyx canescent; lower lip lance- 

 olate, 5 mm. long, the upper lance-ovate, 4 mm.; corolla about 7 mm. long, 

 purple; banner glabrous; pod about 1 cm. long, about 3-seeded. Sterile hill- 

 sides: Ore. — Ida. — Utah. Son. — Suhmont. Jl. 



75. L. micensis Jones. Branching from the base; branches decumbenti 

 5-15 cm. long, silky- villous, with long spreading hairs; leaflets obovate, oblance" 

 olate or spatulate, 1-1.5 cm. long, silky-villous, with long spreading hairs, obtuse; 

 racemes 2-5 cm. long; bracts lanceolate, persistent; calyx long-hairy; lips sub- 

 equal, broadly lanceolate, 4 mm. long; corolla about 7 mm. long, reddish purple; 

 legume about 1.5 cm. long, 3-4-seeded. Sandy or gravelly slopes: Nev. — Utah 

 ^Ariz. Son. Ap-My. 



76. L. brevicaulis S. Wats. Subacaulescent; leaflets 7-8, cuneate-obovate 

 or spatulate, rounded at the apex, sparingly ciliate on both sides, 7-15 mm. long; 

 peduncles 2-5 cm. long; bracts lanceolate, short, persistent; calyx ciliate; lips 

 ovate, subequal, 3-4 mm. long; corolla 6-8 mm. long, blue; pods 1-1.5 cm. long. 

 On hills: Ore. — Calif. — N.M. — Colo. Son. — Submont. 



77. L. Kingii S. Wats. Stem branched near the base, 1-1.5 dm. high, with 

 siDcy-villous, spreading hairs; leaflets oblanceolate, 1-2.5 cm. long, silky-villous 

 on both sides; racemes 1-3 cm. long; bracts lanceolate, shorter than the buds, 

 persistent; calyx ciliate, lower lip 7-8 mm. long, oblong-lanceolate, the upper 

 broadly ovate; corolla purplish, 8 mm. long; pod ciliate, 1 cm. long. L. Sileri 

 S. Wats. L. capitatus Greene. Dry soil: Utah — Colo. — Ariz. Son. — Submont. 

 Je-Jl. 



78. L. scaposus Rydb. Stem branched at the base, 1-1.5 dm. high, spar- 

 ingly ciliate; leaflets about 7, spatulate, 1 cm. long, sparingly silky-hirsute on 

 both sides or glabrous above; raceme 1-4 cm. long; bracts lanceolate, short; 

 calyx ciliate, the lower lip broadly lanceolate, 5 mm. long, the upper ovate; 

 corolla purplish, 6 mm. long, paler at the base; banner shorter than the wings; 

 legume 1 cm. long. Sandy soil: Colo. Son. 



79. L. rubens Rydb. Stem ciliate, tinged with red, branched near the 

 base, about 1 dm. high; leaflets 6-7, spatulate, 1-1.5 cm. long, ciliate on both 

 sides or glabrous above, acute; raceme lax, 5-10 cm. long; bracts minute, subu- 

 late; calyx ciliate, the lower lip lanceolate, 5 mm. long, the upper barely 3 mm. 

 long; corolla 7 mm, long; banner dark purple, with a yellow spot; wings and keel 

 hghter. Sandy soil: s Utah. L. Son. 



80. L. pusillus Pursh. Stem with branches decumbent near the base, 

 stout, 0.5-2.5 dm. high, hirsute; leaflets 5-8, oblong-oblanceolate, glabrous above, 

 sparingly hirsute beneath, 2-3 cm. long, rounded at the apex; racemes short- 

 peduncled, 3-8 cm. long; calyx hirsute-ciliate ; lower lip broadly lanceolate, 6 

 mm. long, the upper 4-5 mm. long; corolla tinged with rose or purple, or almost 

 white, 8-10 mm. long; legume nearly 2 cm. long. Plains and sandy places: 

 Wash.— Nev.— N.M.—Kans.—Sask. Son.— Plain. My-Jl. 



4. TRIFOLIUM (Tourn.) L. Clover, Trefoil. 



Annual or perennial herbs. ' Leaves alternate, digitately 3-foliolate, rarely 

 5-7-foliolate, with toothed (in ours mostly finely denticulate) or rarely entire 

 leaves. Flowers perfect, in heads or short dense racemes, bracted at the base. 

 Calyx pedicelled, campanulate; lobes 5, elongate, often subequal, or the upper 

 broader and more or less united. Corolla in ours purple, pink, or white; banner 

 in ours straight; wings narrow and longer than the keel. Stamens 10, diadel- 

 phous; anthers all alike. Pod flattish or terete, included in the persistent cor- 

 olla, often indehiscent; seeds few or solitary. 



