476 FABACEAE 



none emarginate; peduncles slender, twice as long as the leaves; involucre only 

 slightly lobed, laciniate. Subsaline ponds: Nev. Wyo. Plain. 



44. T. oliganthum Steud. Glabrous; stem erect, slender, 2-4 dm. high, 

 branched; leaflets of the lower leaves cuneate-oblong, of the upper linear or lance- 

 linear, acute; involucre 3 mm. high, divided below the middle and laciniately 

 spinulose-toothed ; head few-flowered; calyx-tube 2.5 mm. long; teeth lanceolate, 

 spinulose, acuminate, 2 mm. long; corolla dull purple, 6-7 mm. long. T. pauci- 

 florum Nutt., not Urv. T. filipes Greene. Roadsides, hills, and banks: B.C. 

 Calif. Ariz.; Mex. Submont. Ap-Je. 



45. T. cyathiferum Lindl. Glabrous; stem prostrate or ascending, 3-5 dm. 

 long; leaflets obovate-cuneate to elliptic, 1-2 cm. long; peduncles 5-10 cm. long; 

 involucre white at the base, 8-10 mm. high, with rounded, spinulose dentate 

 lobes; calyx glabrous; tube inflated, veiny, 3-4 mm. long; teeth ovate; corolla 

 rose-colored. Moist places: B.C. Ida. Calif. Submont. 



46. T. microcephalum Pursh. Annual; stems ascending or procumbent, 

 branched, usually sparingly villous, 2-4 dm. high; leaflets obcordate or obovate- 

 cuneate, emarginate, 5-15 mm. long, sparingly villous; peduncles 3-5 cm. long; 

 involucre white at the base, with ovate acuminate lobes; calyx pubescent; tube 

 and subulate teeth each about 2 mm. long; corolla about 6 mm. long, purplish. 

 Hillsides and wet places: B.C. L. Calif. Nev. Mont. Submont. My-Au. 



47. T. procumbens L. Decumbent annual; stem 1.5-4 dm. long; leaflets 

 obovate, truncate or emarginate at the apex, finely denticulate, 1-1.5 cm. long, 

 the terminal one petiolulate; flowers reflexed in fruit; corolla yellow, striate, 

 marcescent. Fields and roadsides: N.S. Fla. Tex. Colo. Minn.; adv. or 

 nat. from Eu. My-S. 



6. MEDICAGO (Tourn.) L. MEDICK, ALFALFA, LUCERNE, NONESUCH. 



Mostly perennial herbs, sometimes shrubby plants. Leaves alternate, pin- 

 nately trifoliolate, with commonly toothed leaflets. Flowers perfect, in elongate 

 or head-like racemes. Calyx pedicelled, campanulate; lobes slender, nearly 

 equal. Corolla purplish or yellow; banner oblong, subsessile; wings nearly 

 oblong; keel obtuse, shorter than the wings. Stamens 10, diadelphous; anthers 

 all alike. Stigma oblique. Pods curved or spirally coiled, often spiny, reticu- 

 late, indehiscent. 



Pod unarmed. 



Perennial, erect; corolla violet or blue; fruit spirally coiled in 2-3 turns. 



1. M. saliva. 



Annual, prostrate; corolla yellow; fruit merely curved. 2. M. lupulina. 



Pod prickly, densely spirally coiled, in 2-3 turns; corolla yellow. 3. M. hispida. 



1. M. sativa L. Perennial; stem decumbent or ascending at the base, spar- 

 ingly hairy, in age glabrous, branched, 3-10 dm. high; leaflets oblong, oblance- 

 olate, or cuneate-obovate, 1-3 cm. long, sharply denticulate towards the apex, 

 obtuse or truncate, mucrpnate; racemes oblong, 1-5 cm. long; corolla 8-10 mm. 

 long; pods pubescent, twisted into 2-3 spires. ALFALFA, LUCERNE. Fields and 

 fence rows: Me. Va. Calif. B.C.; Eu.; cult, and escaped. My-S. 



2. M. lupulina L. Annual; stem prostrate, branched at the base, 3-6 dm. 

 long, sparingly pubescent; leaflets usually broadly obovate or obcordate, denticu- 

 late above the middle, emarginate and mucronate, sparingly hairy, 4-15 mm. 

 long; raceme dense, short and head-like, less than 1 cm. long; corolla about 3 

 mm. long; pod pubescent, strongly reticulate. NONESUCH. Fields and waste 

 places: N.S. Fla. Mex. Calif. Wash.; nat. from Eurasia; rare in the Rocky 

 Mountains. Mr-D. 



3. M. hispida Gaertn. Annual; stem branched at the base, with ascending 

 or spreading branches, glabrous or sparingly strigose; leaflets obovate, rounded to 

 obcordate at the apex, crenulate above the middle, 1-1.5 cm. long; flowers in 

 few-flowered heads; corolla yellow; pods several-seeded, reticulate, armed on 

 the edges with curved prickles. M . denticulata Willd. BUR CLOVER. Waste 

 places: N.S. Fla. Tex. Mont.; Calif .Wash. ; adv. from Eu. Je-Au. 



