LEGUMINOS^E. 75 



rugose ; style filiform, as long as the legume ; seeds unequally cordate. 

 Trifolium qfficinale, var. a. Linn. 



Fields. Can. to Geor. Aug. . Stem 2 4 feet high. Flowers in long ra- 

 cemes, yellow. Plant giving out an odor when dry, similar to the vernal grass. 

 Introduced from Europe. Yellow Melilot. 



2. M. leucantha D. C. : stem erect, branched ; leafets ovate-oblong, 

 truncate and mucronate at the apex, remotely serrate ; stipules setaceous ; 

 teeth of the calyx unequal, as long as the tube ; standard longer than the 

 keel and wings ; legume 1 2-seeded, ovate, lacunose-rugose, green ; seeds 

 exactly ovate. M. vulgaris WUld. Enum. "Frifolium officinale, var. b. 

 Linn. 



Fields. N. S. July, Aug. .Slem 35 feet high. Flowers white. Ra- 

 cemes longer and less crowded than in the former. Both species become fragrant 

 upon drying. Introduced. White Melilot. Scented Clover 



6. TRIFOLIUM. Tourn. Clover Trefoil. 

 (From the Latin tres, three ; and folium, a, leaf.) 



Calyx tubular, persistent, without glands, 5-cleft or 5-toothed. 

 Segments subulate. Keel shorter than the wings and standard. 

 Stamens diadelphous. Legume small, scarcely dehiscent, often 

 ovate, 1 2-seeded, as long as the calyx and covered by it, 

 rarely oblong, 3 4-seeded, and a little exceeding the calyx. 



* Legume 1-seeded. Standard of the cor olid deciduous. Flowers not yellow . 



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

 on short petioles ; leafets obovate-linear or cuneate-oblong, somewhat 

 toothed at the apex ; stipules ovate, acuminate ; spikes oblong-cylindric, 

 very villous ; segments of the calyx pilose, equal, setaceous, longer than the 



corolla. 

 Dry i 

 Flowers minute, white or 



Dry pastures. Can. to Flor. May Sept. . Stem 6 12 inches high, 

 pink. Seeds ovoid, brown. Introduced from Europe. 



Stone Clover. Hare's-foot Trefoil 



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

 leafets oval or oblong-ovate, often retuse or emarginate, nearly entire ; stip- 

 ules broad-lanceolate, terminating in a subulate point; heads of flowers 

 ovate, dense, nearly sessile ; segments of the calyx setaceous, about half as 

 long as the corolla, the lower one longer than the rest. 



Meadows. Can. to Flor. W. to Oregon. May Oct. '2J.. Stem 12 feet 

 high. Flowers united into a tube at the base, rose-colored. Seeds yellowish, 

 reniform. Introduced from Europe. Red Clover 



3. T. Pennsylvanicum Willd. : stem ascending, much branched, flexu- 

 ous ; leafets ovate-elliptic, obtuse, very entire ; stipules awned ; heads of 

 flowers ovate-cylindric, solitary, dense ; lower tooth of the calyx shorter 

 than the corolla. 



Woods. Mass, and Penn. June Sept. Q. Flowers fine red. Resembles 

 T. medium of Linnaeus. Introduced ? Buffalo Clover. 



