92 LEGUMINOS^E. (PULSE FAMILY.) 



Peekskill, New York, and E. Massachusetts, where it is thoroughly established 

 on steiile hills hi Essex County. June. (Adv. from Eu.) 



4. TRIFOL-IUM, L. CLOVER. TREFOIL. 



Calyx persistent, 5-cleft, the teeth bristle-form. Corolla withering or persist- 

 ent : standard longer than the wings, these mostly longer than the keel, and 

 united with it by their slender claws. Stamens more or less united with the 

 corolla. Pods small and membranous, often included in the calyx, 1 - 6-seeded, 

 indehiscent, or opening by one of the sutures. Tufted or diffuse herbs. Leaves 

 mostly palmately 3-foliolate : leaflets often toothed. Stipules united with the 

 petioles. Flowers chiefly in heads or spikes. (Name from tres, three, and 

 folium, a leaf.) 



* Flowers sessile in dense heads : corolla purple or purplish, withering away after 



flowering, tubular below, the petals more or less coherent with each other. 

 *- Calyx-teeth silky-plumose, longer than the whitish corolla,. 



1. T. ARVENSE, L. (RABBIT-FOOT CLOVER. STONE CLOVER.) Silky, 

 branching (5' -10' high) ; leaflets oblanceolate ; heads becoming very soft-silky 

 and grayish, oblong or cylindrical. Old fields, &c. (Nat. from Eu.) 



- *- Calyx almost glabrous, except a bearded ring in the throat, shorter than the rose- 

 red or purple elongated-tubular corolla. (Flowers sweet-scented.) 



2. T. PRATENSE, L. (RED CLOVER.) 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 ovate, sessile, (g) 1J. Fields 

 and meadows ; largely cultivated. (Adv. from Eu.) 



3. T. MEDIUM, L. (ZIGZAG CLOVER.) Stems zigzag, smoothish; leaflets 

 oblong, entire, and spotless ; heads mostly stalked; flowers deeper purple and larger : 

 otherwise like the last. 1|. Dry hills, Essex Co., Massachusetts. (Adv. 

 from Eu.) 



# # Flowers pedicelled in umbel-like round heads on a naked peduncle, tfieir short 

 pedicels reflexed wlien old: corolla white or rose-color, withei'ing-persistent and turn- 

 ing brownish in fading ; the tubular portion short. 



4. T. reflcxum, L. (BUFFALO CLOVER.) Stems ascending, downy; 

 leaflets obovate-oblong, finely toothed ; stipules thin, ovate ; calyx-teeth hairy ; 

 pods 3-5-seeded. (2) Western New York (rare) to Kentucky and south- 

 ward. Heads and flowers larger than in No. 2 : standard rose-red ; wings and 

 keel whitish. 



5. X Stolon iferum, Muhl. (RUNNING BUFFALO-CLOVER.) Smooth, 

 stems with long runners from the base ; leaflets broadly obovate or obcordate, minutely 

 toothed ; heads loose ; pods 2-seeded. 1J. Open woodlands and prairies, 

 Ohio to Illinois, Kentucky, and westward. Flowers white, tinged with purple, 

 as large as No. 4, which this too closely resembles. 



6. T. repeilS, L. (WHITE CLOVER.) Smooth; the slender stems 

 spreading 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 ; pods about 4-seeded. 1J. Pastures, waste 



