DICOTYLEDONS. 119 



1. T. procumbp:ns L. Low Hop-clover. Annual ; stem slen- 

 der, erect, diffuse or decumbent, pubesc(mt, 6-10 in. long ; leaves 

 sliort-petioled ; leaflets obovate or obcordate, finely dentate, the 

 middle one distinctly stalked ; stipules lance-ovate ; flowers yellow, 

 reflexed in fruit ; legume 1-seeded. February- April. Common on 

 clay soil in waste places. 



2. T. iNCARXATUM L. Crimson Clover. Annual ; stem erect, 

 somewhat branched, pubescent, 1-2 ft. high ; lower leaves long-, the 

 ui)per short-petioled ; leaflets obovate or cuneate, toothed at the apex ; 

 flowers bright crimson, sessile, in terminal heads which finally 

 become much elongated; calyx silky, its lobes long and plumose. 

 March- April. Introduced and cultivated for fodder. 



3. T. pratexse L. IvEi) Clover. Biennial or short-lived 

 perennial ; stems diffuse, branching, becoming d,ecumbent, pubes- 

 cent, l-o ft. long ; leaves long-petioled ; stipules large ; leaflets oval 

 to obovate, finely toothed, often with a dark triangular spot near the 

 center; flowers red or purple, in globose heads, erect in fruit; calyx 

 teeth setaceous, hairy ; legume 1-3-seeded. April-September. In- 

 troduced and widely cultivated. 



4. T. REKLEXUM L. BuKFALO Clover. Annual or biennial ; 

 stem erect or ascending, pubescent, 8-15 in. long; leaves long- 

 petioled ; stipules ovate, acuminate ; leaflets obovate, denticulate, 

 prominently straight-veined ; heads globose, peduncled ; flowers 

 rather large, reflexed in fruit ; calyx shorter than the corolla, the teeth 

 linear ; standard red or pink, wings and keel white ; legume 3-5- 

 seeded. April-^NIay. Along fences and ditch banks on rich soil. 



5. T. Carolinianum Michx. Carolina Clover. Perennial ; 

 stems diffuse or ascending, much-branched, pul)escent, G-10 in. long; 

 leaves short-petioled; leaflets small, obovate or obcordate, slightly 

 toothed; heads small, globose, on long peduncles; flowers white, 

 tinged with purple, reflexed in fruit; legume l-seeded. March-April. 

 Common in waste places. 



0. T. REPENs L. AViiiTE Clover. Perennial ; stems widely 

 branching at the base, prostrate and creeping', nearly smooth, 0-12 

 ill. long; leaves long-petioled; leaflets oval, obovate or olicordate, 

 denticulate ; heads globose, long-pedunclcd ; flowers white, reflexed 

 ill fruit; legume 3-1-stM'ded, April-November. Introduced; com- 

 mon about houses and in ]»astures. 



VII. PSORALEA. 



Poroiiiiial herbs; wliob; jihint ghuidiihir-dotted ; loaves 3-5- 

 foliate; stipules cohering with tlie ])etioles; flowers in axil- 

 lary or terminal si)ikes or racemes; calyx r)-eleft, the lobes 



