Pea Family. 35 



petals united at the base: standard oblong- or obovate, reflexed. Stamens 

 diadelphous. ( .) and 1: pod included in the calyx or scarcely longer, l-:>- 



seeded. 



T. pratense L. Red C. Perennial: stems ascending-, somewhat pubescent: 

 leaflets oval or obovate, obtuse or emarginate, with a pale spot on the upper 

 surface; stipules large, bristle pointed; heads globular, sessile; flowers rose 

 purple, sweet scented: lower tooth of the calyx longer than the 4 other equal 

 ones. Meadows: May-September: common. 



T. repens L. White C. Perennial, low. creeping: leaves loug-petioled; 

 leaflets obcordate, minutely toothed: stipules narrow, scarious; flowers in a 

 long-peduncled globular head, white: calyx small, teeth short: corolla twice 

 the length of the calyx. Fields and waste places: May-September: common. 



T. hybridum L. Alsike C. Perennial, stems erect or suberect, somewhat 

 pubescent: leaflets much as in T. repens: flowers rose-tinted. Fields and 

 waste places: May-September; frequent. 



T. reflexum L. Buffalo C. Annual or biennial, erect or procumbent, 

 glabrous or pubescent: leaflets obovate or ovate oblong: stipules foliaceous. 

 ovate-acuminate: flowers in a large head, slender pedicelled. at length re- 

 flexed: calyx short: calyx-teeth v^vy long and narrow: standard rose-red. 

 wings and keel whitish. Sandy soil near river banks: April-August; infre- 

 quent: Muscatine. Johnson. Penton. Clinton, and Union counties. 



T. stoloniferum Muhl. Perennial; glabrous, with long basal runners: 

 leaflets obovate or obcordate: stipules ovate-lanceolate, membranous: flowers 

 white, with a purplish tinge. Reported from Woodbury county. 



T. crvense L. Annual, silky, about 8 inches high, simple or branched; 

 leaflets oblanceolate: heads oblong; calyx-teeth bristle-like, plumose; petals 

 whitish. Fields; infrequent: Winneshiek and Story counties. 



T. agraMum L. Yellow C. Annual, six inches or more high, upright: 

 leaflets obovate or oblong: stipules linear-lanceolate; flowers in oblong or 

 oval heads, yellow. Waste places: infrequent: Story county. 



T. procumbens L. Low Hop C. Annual, 3-(i inches high, procumbent or 

 ascending, pubescent: leaflets cuneate-obovate: stipules ovate; heads globose, 

 yellow. Meadows and pastures; infrequent; Fayette. Johnson, Lee, Story. 

 and Winnebago counties. 



MELILOTUS Juss. Biennial smooth herbs, with 3-foliate petioled leaves, 

 dentate leaflets: subulate stipules, and small flowers in siender spike-like 

 racemes. Calyx small, 5-cleft: teeth short, nearly equal. Corolla about twice 

 the length of the calyx. Stamens diadelphous. Pod longer than the calyx, 

 ovoid, wrinkled, coriaceous, 1-2-seeded. 



M. alba Desv. White MeWjot. Sweet Clover. Stem 2-0 feet high; leaflets 

 oblong or oblanceolate; flowers white, standard longer than the other petals. 

 Waste places: dune-September: becoming common. 



M. officinalis (L.) Lam. Yellow Af. Resembling the preceeding: leaflets 

 ovate, oblong, or oblanceolate; flowers yellow, standard about equaling the 

 wings and keel. Waste places: infrequent. 



MEDICAGO L. Leaves pinnately 3-foliate. petioled: leaflets denticulate. 

 Calyx ">-cleft. Stamens diadelphous. 9 and 1. Pod 1-several seeded, incurved 

 or coiled. 



M. sativa L. Luacwe. Alfalfa. Perennial, suberect, glabrous: leaflets 

 ovate or oblanceolate: stipules lance-linear: raceme few flowered; flowers 

 violet-purple: pod spirally coiled. Waste places: June-September: infre- 

 quent, widely distributed. 



