POLYPETALOUS EXOGENOUS PLANTS. 217 



and united with them by their claws ; stamens diadelphous 

 (9 and 1) ; legume smooth, membranaceous, 1-6-seeded, 

 oftener shorter than the calyx, scarcely dehiscent. — Tufted 

 or diffuse lierbs. Leaves trifoliolate, the leaflets mostly 

 toothed ; stipules adnate to the petioles ; flowers capitate. 



* Fruiting calyx erect. 



T. PKATENSE, L. {Red Clover.) Hairy ; stems erect ; 

 leaflets oblong-ovate or oval, often emarginate, slightly ser- 

 rulate ; heads large, ovate ; calyx-iQQi\\ setaceous, hairy ; 

 -flowers purple. Stems l°-2° high ; leaves usually marked 

 with a pale 3-angled spot above. 



♦* Fruiting calyx rejlexed. 



T. REFLEXUM, L. {Buffalo Clover.) Pubescent ; stems 

 ascending ; leaflets roundish or obcordate, toothed, the up- 

 permost oblong ; heads globose ; cali/x-tube very short ; the 

 subulate teeth long and hairy; standard broadly ovate, 

 purple ; the wings and keel white ; legume 3-5-seeded. 

 Annual and biennial. Stems 6-12' long ; heads large. 



T. MACROCALYX, Bcrlauder. Slightly hairy ; stems as- 

 cending, slender ; leaves on slender petioles; leaflets obo- 

 vate-cuneiform, retuse, serrulate ; stipules ovate-lanceolate; 

 heads rather few-flowered, sub-globose, on long peduncles ; 

 flowers at length deflexed, pedicellate ; calgx broad, persist- 

 ent, reticulated, very deeply bilabiate ; the lower lip mi- 

 nute, linear-subulate; the upper 4-cleft, nearly as long as 

 the persistent and scarious corolla; vexillum sessile and 

 broadly oval ; wings lancinate-denticulate at the apex ; the 

 keel small; legume 7-9-seeded, ciliate above. Flowers 

 large. Near Bexar. 



T. REPENS. ( WJiite Clover.) Smooth ; stems creeping ; 

 leaflets roundish or obcordate ; heads globose, long pedun- 

 cled ; calyx-teeth short ; flo2vers white ; legume 4-seeded. 

 Perennial ; ste7n 6-12' long. 



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