68 DICOTYLEDONOUS. 



iUum longer than the calyx. Keel very short. Legume 4-seerled, turgid. 

 White tinged with purple. <v). March — May. Sandy fields. 



Genus XXV. MELILOTUS. 



Calyx tnhi\hr, camj)anulale, 5-toothed, persistent. Petals 

 deciduous. VexiJlu7n longer thnn ihe wing; keel jDeta Is, uni- 

 ted, cohering to the wings. Sti/le liliform. Legumes coria- 

 ceous one to few seeded, nearly globose. Leaves trifoliate. 

 Flowers in axillary racemes. 



1. M. OFFiciiVATjs. Stem erect, angular, glabrous, vvilh spreading branch- 

 es ; leafleis-ohuvaie, obtuse remotely serrate, glabrous. Flowers in loose ra- 

 cemes, teeth of the calyx unequal Legumes 2-seeded, rugose, acute, ovate. 



Yellow Melilot. 

 Yellow. 0. June— Aug. Rich soils. Introduced. 2--4 feet. 



Genus XXVI. MEDICAGO. 



Calyx somewhat cylindrical, S-cleft, keel of the corolla, 

 bending from the vexillum. Legume spirally coiled, many 

 seeded, compressed. 



1. M. LupuLiNA. Stem procumbent, diffuse, assurgent, angled, hairy. 

 Leaves teraaie, on short petioles ; leaflets oblong, cuneate, emarginate, den- 

 ticulate near the summit, hairy. Flowers in axillary heads. Legumes reni- 

 form, 1-seeded, black. 



Yellow. %. June— Aug. Cultivated grounds. Introduced. 6-12 in. 



Genus XXVII. ASTRAGALUS. 



Calyx 5 -toothed, keel obtuse. Stamens monadelphous. 

 Legume 2.celled, by ibe inflexion of the lower suture. Leaves 

 unequally pinnate ; leaflets numerous. 



1. A. Obcordatus. Stem nearly glabrous, decumbent or assurgent ; leaf- 

 lets 15-25, ob-cordate, small, on j)artial petioles. Flowers in ovate spikes 

 Calijx\\n\\y^ wiih subulate teeth. Legumes oblong slightly curved, acute. 



While. %. Southern Georgia, Florida. 4-8 inches. 



2. A. CANADENsts. Stem erect, canescent, somewhat branched ; leaflets 

 very numerous, 25-41, oblong, pubescent underneath. Floivers in compact 

 elongated, axillary spikes; peduncles long, bracts subulate. Cali/x hairy. 

 Teeth subulate, small, corolla much longer than the calyx. Legume terete, 



_^labrous, many seeded. 



Pale yellow. %. June— July. Mountains. 1-3 feet. 



3. A. Glaber. Stem erect, glabrous. Leaflets numerous, 15-23, small, 

 linear oblong, hairy underneath. Flowers in elongated spikes, few flowered 

 3-6 ; peduncles long as the calyx. Legume glabrous, acute at each end, in- 

 curved. 



Whitish. %. April. Low country of Ga. 1-2 ft. 



GENtJS XXVIII. PHACA. 



Calyx 5-cleft, the two upper segments more remote than 

 the others. Keel obtuse. Style smooth ; stigma capitate. 



