218 SYSTEMATIC BOTANY. 



nodding, in axillary racemes ; lower imperfect flowers on radical peduncles : 

 cauline legumes 3~7-seeded ; radical ones often beneath the surface, i-seeded. 

 A very delicate vine in low woods and thickets. July-September. 



7. Robinia. Calyx short, campanulate, 5-toothed. Banner large. 

 Keel obtuse. Stamens diadelphous. Style bearded on the inside. 

 Legume compressed, many-seeded. Trees and shrubs. y. 



R. PSEUDACACIA (Locust-Tree}. Branches with stipular prickles; 

 leaves Q-ig-foliate ; leaflets ovate, or oblong-ovate, thin, smooth ; flowers 

 large, white ; legumes smooth. A beautiful tree with elegant foliage. May- 

 June. 



8. Tephrosia. Calyx equally 5-cleft ; standard roundish. Pod 

 linear. Hoary herbs, y. 



T. VIRGINIANA (Goafs Rue). Villous ; stem simple, erect ; leaves 17-29- 

 foliate ; leaflets oblong, softly villous beneath ; racemes terminal, oblong ; 

 flowers large, pale yellow and purple ; legumes falcate, villous. In sandy 

 soils, 1-2 feet high. July. 



9. Trifolium. Calyx tubular, campanulate, 5 -cleft, persistent. Pet- 

 als withering. Banner larger than the wings, reflexed. Wings oblong. 

 Legume small, membranaceous, indehiscent. Seeds sub-globose. 

 Leaves trifoliate. Flowers in dense heads. 



1. T. REPENS (White Clover). Smooth; stem creeping, spreading; 

 leaflets obcordate, denticulate ; petioles long ; stipules narrow-lanceolate ; 

 heads globose ; corollas white, becoming pale brown, very fragrant, reflexed 

 when past flowering ; legume 4-seeded. In damp soils. 



2. T. ARVENSE (Rabbi? 's-foot Clover}. Silky-pubescent ; stem erect, 

 branching ; leaflets oblong-obovate, minutely 3-toothed at apex ; petioles 

 very short; flowers pale red or whitish, in cylindrical, very hairy heads. A 

 hairy plant, 3'-8' high, in pastures and dry soils. July-August. 



3. T. PRATENSE (Red Clover). Stems hairy, slightly pubescent ; leaflets 

 ovate, with a large, lighter-colored spot in the center ; stipules ovate-lanceo- 

 late, membranaceous, strongly nerved ; flowers red, in dense, short, fragrant 

 heads. Cultivated for hay. 



10. Melilotus. Calyx tubular, persistent, 5-toothed. Corolla de- 

 ciduous. Keel-petals completely united, cohering with the wings. 

 Stamens in 2 sets (9 and i). Legume coriaceous, i-few seeded, y 



M. OFFICINALIS (Yellow Mellilot Clover}. Stem erect, branching, 

 smooth ; leaves pinnately 3-foliate ; leaflets obovate-oblong, obtuse ; flowers 

 yellow, in loose, axillary racemes ; legume ovate, 2-seeded. In alluvial soils, 

 2-3 feet high. June-August. 



11. Medicago. Calyx 5-cleft, somewhat cylindric. Keel of the 

 corolla remote from the standard. Legume falcate, or spirally coiled, 

 usually many-seeded. 



