LEQUMINOSAE (PULSE FAMILY) 509 



Flowers 6-9 mm. long ; corolla white or pink ; peduncles 



mostly 8-many times the length of the heads . . 8. T. rtpenf. 



Not stoloniferous 9. T. hybridum. 



o. Calyx-teeth deltoid-lanceolate, herbaceous 10. T. carolinianum. 



b. Corolla yellow. 



Corolla conspicuously striate-sulcate in age. 



Leaflets all sessile 11. T. agrarium. 



Terminal leaflet stalked 12. T. procumbent. 



Corolla not striate-sulcate 18. T. dubium. 



1. T. ARVENSE L. (RABBIT-FOOT or STONE C.) Silky branching annual, 

 1-4 dm. high ; leaflets oblanceolate ; heads becoming very soft-silky and grayish, 

 ovoid-cylindrical. Dry sandy or gravelly soil, roadsides, etc. (Nat. from Eu.) 



2. T. INCARNATUM L. (CRIMSON or ITALIAN C.) Suberect soft-pubescent 

 annual, 3-6 dm. high ; heads cylindrical, often 5 cm. 'long ; leaflets obovate. 

 Often cultivated, and sparingly escaping. (Introd. from Eu.) 



3. T. PRATENSE L. (REoC.) Perennial ; stems ascending, somewhat hairy : 

 leaflets oval or obovate, often notched at the end and marked on the upper side 

 with a pale spot ; stipules broad, bristle-pointed ; heads ovoid, sessile or not rarely 

 pedunculate; corolla magenta to whitish ; calyx soft-hairy. Fields and mead- 

 ows ; extensively cultivated. (Introd. from Eu.) 



4. T. MEDIUM L. (ZIGZAG C.) Stems zigzag, smoothish ; leaflets oblong, 

 entire, and spotless; heads mostly stalked; flowers deeper purple; calyx-tube 

 nearly or quite glabrous ; teeth slightly rigid, scarcely ciliate. Dry hills, e. 

 Mass. ; several reports from other Am. localities appear to refer to the preceding 

 species. (Nat. from Eu.) 



6. T. virgfnicum Small. Low villous perennial, not stoloniferous ; leaflets 

 narrowly oblong, denticulate ; flowers nearly white, in large heads ; short calyx 

 canescent-pubescent. Rocky slopes, Kate's Mt., W. Va. 



6. T. reflSxum L. (BUFFALO C.) Annual or biennial; stems ascending, 

 downy ; leaflets obovate-oblong, finely toothed ; stipules thin, ovate ; standard 

 rose-red; wings and keel whitish; calyx-teeth hairy; pods 3-5-seeded. 

 Borders of fields and woods, w. N. Y. and Ont. to la., "Neb.," Kan., and 

 southw. 



7. T. stoloniferum Muhl. Smooth perennial ; stems with long runners from 

 the base ; leaflets broadly obovate or obcordate, minutely toothed ; heads loose ; 

 flowers white, tinged with purple ; pods 2-seeded. Open woodlands and prai- 

 ries, O. and Ky., w. to la., "Neb.," and Kan. 



8. T. r&pens L. ( WHITE C.) Smooth perennial ; the slender stems spread- 

 ing and creeping-; leaflets inversely heart-shaped or merely notched, obscurely 

 toothed ; stipules scale-like, narrow ; petioles and especially the peduncles very 

 long ; heads small and loose ; calyx much shorter than the white corolla ; pods 

 about 4-seeded. Fields and copses, everywhere ; indigenous only in the north- 

 ern part of our range, if at all. (Eurasia.) 



9. T. HYBRIDUM L. (ALSIKE C.) Resembling T. repens, but the stems 

 erect or ascending, not rooting at the nodes ; leaflets ovate, rounded at apex ; 

 flowers rose-tinted. Generally common. (Introd. from Eu.) 



10. T. carolinianum Michx. Somewhat pubescent small perennial, pro- 

 cumbent, in tufts; leaflets wedge-obovate and slightly notched ; stipules ovate, 

 foliaceous ; heads small, on slender peduncles ; calyx-teeth lanceolate, nearly 

 equaling the purplish corolla ; standard pointed ; pods 4-seeded. Rocky places, 

 Va. to Fla., Tex., and Kan.; introd. on waste ground near Philadelphia. 



11. T. AGRARIUM L. (YELLOW or Hop C.) Smoothish annual, somewhat 

 upright, 1-3 dm. high ; leaflets obovate-oblong, all three from the same point 

 (palmate) and nearly sessile ; stipules narrow, cohering icith the petiole for more 

 than half its length; corolla yellow, persistent, becoming dry and brown in age. 

 (T, aureum at least of Am. auth.) Sandy fields and roadsides ; N. S. to Va. ; 

 also in w. N. Y., Ont., and la. (Nat. from Eu.) 



12. T. PROCUMBENS L. (LowHopC.) Similar ; stems spreading or ascend- 

 ing, pubescent, 1-1.5 dm. high ; leaflets wedge-obovate, notched at the end, the 

 lateral at a small distance from the other (pinnately 3-foliolate) ; stipules ovate, 

 short. Sandy fields and roadsides, common. (Nat. from Eu.) 



