LEGUMINOS^E. 79 



6. TRIFOLIUM. Tourn. 



Calyx tubular, persistent, without glands, 5-cleft ; seg- 

 ments subulate. Keel shorter than the wings and standard. 

 Stamens diadelphous. Legume small, scarcely dehiscent, 

 often ovate, I 2-seeded, as long as the calyx and covered 

 by it, rarely oblong, 3 4-seeded, and a little exceeding the 

 calyx. Leaves ternate. Diadelphia. Decandria. 



* Letrume 1-seeded. Standard of the corol deciduous. Flowers not 

 yellow. 



1. T. arvcnse Linn. : stem erect, simple or branched, pubescent ; 

 leaves on short petioles ; leafets linear-obovate, hairy, somewhat 

 3-toothed at the apex ; stipules narrow, membranaceous, with very long 

 nerves, subulate, pilose ; spikes oblong, villous, cylindrical ; calyx; very 

 pilose ; segments equal, longer than the many petalled corol. 



HAB. Dry pastures. Can. to Car. June Sept. 0. Stem 

 610 inches high. Flowers minute, white or pink. Seeds ovoid, 

 brown. Stone Clover, Hare's-foot Trtfoil, 



2. T. pratense Linn. ; stem suberect, branched ; leaves on long pe- 

 tioles ; leafets oval, nearly entire ; stipules broad, nerved, smooth, 

 shortly acuminate, inflexed ; heads of flowers ovate, obtuse, subses* 

 sile ; calyx hairy ; lower tooth shorter than the tube of the monopeta- 

 lous unequal corol ; seeds reniform, compressed, 



HAB. Meadows. May Oct. !. Stem 12 feet high. Flowers 

 rose-coloured. Seeds yellowish, Introduced. Red Clover. 



3. T. pennsylvanicum Wittd. : stem ascending, much branched, 

 flexuous ; leafets ovate-elliptic, obtuse, very entire ; stipules awned ; 

 heads of flowers ovate-cylindrical, solitary, dense ; lower tooth of the 

 calyx shorter than the monopetalous corol. 



HAB. Woods. Penn. to Virg. June- Sept. y. Flowers fine 

 red. Resembles T. medium of Linnaeus. 



** Legume l-seeded. Standard of the corol persistent, scariose. Flowers 



yellow, 



4. T. procumbens Linn. : stems procumbent ; leaves on short petioles ; 

 leafets obovate or obcordate, denticulate, terminal one petioled ; sti- 

 pules ovate, ciliate, shorter than the petiole ; heads axillary, ovate : 

 peduncles equal to or longer than the leaves ; segments of the calyx 

 unequal, the 2 upper ones very short ; seeds elliptic. 



HAB. Dry fields. Mass, to Virg. June. 0. Stem spreading, 

 36 inches long. Flowers numerous and with th3 seeds yellow. 

 Introduced. ? According to De Candolle T. campestre is a mere 

 var. with erect branching stems. Yellow Clover. 



5. T. agrarium Linn. : stem ascending, with erect branches ; leaves 

 nearly sessile ; leafets oblong-ovate, sessile, denticulate ; stipules 

 leafy, lanceolate, acute, longer than the petiole ; heads on long pe- 



