130 ROSALES 
Pods 1-5 cm. long, inflated; foliage blackening in drying. 
3. Baptisia. 
Stamens united by their filaments into one or two groups. 
Leaves simple, digitate or odd-pinnate, never tendril-bearing. 
Leaves simple, 3-foliate or digitately many-foliate. 
Herbs not climbing. 
Leaves simple, rarely 3 or 5-foliate in Phaca, and Homalobus. 
Leaves lanceolate to oval, anthers of two kinds. 
5. Crotolaria. 
Leaves linear to linear-spatulate, usually many times as long 
as wide. 
Peduncles much shorter than the leaves, flowers pink. 
14. Phaca. 
Peduncles equaling or longer than the leaves, flowers 
purple. 13. Homalobus. 
Leaves 3-foliate, or digitately many-foliate. 
Leaves digitately 5-15 foliate. 
Pods with several seeds. 4. Lupinus. 
Pods 1-seeded. 18. Psoralea. 
Leaves 3-foliate. 
Pod not a loment; i. e. not breaking into 1-seeded joints 
when mature. 
Flowers solitary on axillary peduncles 18-25 mm. long. 
9. Lotus. 
Flowers clustered or if solitary sessile. 
Leaflets dentate or denticulate. 
Pods not curved or coiled. 
Flowers in elongated racemes 5-10 cm. long, pod 
longer than calyx. 7. Melilotus. 
Flowers in heads or dense spikes, pod included 
in the calyx. ..6. Trifolium. 
Pods curved or cuiled. 8. Medicago. 
Leaflets entire. 
Acaulescent or the stems covered with imbricated, 
scarious stipules. 15. Orophaca. 
Caulescent, stems not covered with stipules. 
Calyx lobes, or at least some of them shorter than 
the pods, much exceeded by the corolla. 
18. Psoralea. 
Calyx lobes in our species twice as long as the 
pods, nearly as long as the corolla. 
26. Lespedesa. 
Pod a loment, much constricted between the seeds and 
breaking into one-seeded joints when mature. 
25. Meibomia. 
Vines, 
Flowers all petaliferous; capitate or solitary. 
23. Strophostylus. 
Flowers of two kinds, the petaliferous in racemes, the ape- 
talous solitary on creeping branches. 24. Falcata. 
Leaves odd-pinnate, 5-many foliate. 
Trees. 10. Robinia. 
