70 Spring Flora of Ohio. 



Med-i-ca'-go lu-pu-li'-na L. Black Medick; Nonesuch. — Procumbent, 

 pubescent; flowers yellow, in short spikes; pods kidney- form. 



7. Genus MEL-I-LO'-TUS.— Flowers nearly as in Trifolium (Clover), 

 but small and in spike-like racemes ; pod ovoid, coriaceous, wrinkled. 



Mel-i-lo'-tus of-fic-i-na'-lis Willd. Yellow Melilot; Sweet Clover.— Up- 

 right, 2-4 ft. high ; leaflets obtuse ; corolla yellow. 



Mel-i-lo'-tus al'-ba Lam. White Melilot: Sweet Clover. — Leaflets 



truncate ; corolla white. 



8. Genus TRI-FO'-LI-UM.— Cal>-x 5-cleft, the teeth bristle - form ; 

 the claws of the petals more or less united below with the stamen- 

 tube. 



A. Flowers sessile, not rejiexed, in dense heads or spikes, purple, purplish, rose- 

 ate or whitish. 



Tri-fo'-li-um ar-ven'-se L. Rabbit-foot or Stone Clover. — Annual, silky, 

 5-10 in. high; calyx-teeth silky-plumose, longer than the whitish 

 corolla; leaflets oblanceolate. Naturalized from Europe. 



Tri-fo'-li-um pra-ten'-se L. Red Clover. — Stems ascending, somewhat 

 hairv; leaflets oval or obovate, often notched; calyx shorter than the 

 tubular corolla. 



Tri-fo'-li-um in - car -na'- turn L. Crimson Clover. — Leaflets ovate, 

 orbicular, obtuse or obcordate, crenate, villous; spike oblong, pedun- 

 culate. Cultivated and often escaped. 



A. Flowers pedicelled, in umbel-like round heads on a naked peduncle, their 

 short pedicels rejlexed when old; corolla white or rose-color, persistent. 



Tri-fo'-li-um sto-len-if'-er-um INIuhl. Running Buffalo Clover. — Leaflets 

 broadly obovate or obcordate ; flowers white, tinged with purple ; pods 

 2-seeded. 



Tri-fo'-li-um re'-pens L. White Clover. — Leaflets inversely heart- 

 shaped or merelv notched; corolla white; pods about 4-seeded. 



Tri-fo'-li-um hy'-bri-dum L. Alsike Clover. — Resembling White Clover 

 {T. repens), but the stems erect or ascending, not rooting at the nodes; 

 flowers rose-tinted. 



A. Flowers short-pedicelled in close heads, reflexed when old; corolla yellow ; 

 annuals, not flowering early. 



