138 Order ROSALES 
Flowers solitary on axillary peduncles, 18-25 mm. long. 
9. Hosackia. 
Flowers clustered or if solitary sessile. 
Leaflets dentate. 
Pods not curved or coiled. 
Flowers in heads or dense spikes; pod included in the 
calyx. 6. Trifolium. 
Flowers in elongated racemes, 5-15 ecm. long; pod 
longer than the calyx. 7. Melilotus. 
Pods curved or coiled. 8. Medicago. 
Leaflets entire. 
Acaulescent, or the short stem covered with scarious 
stipules. 15. Orophaca. 
Caulescent herbs; pods one-seeded, indehiscent. 
Foliage glandular dotted. 18. Psoralea. 
Foliage not glandular dotted. 26. Lespedesa. 
Pod a loment, constricted between the seeds and breaking into 
one-seeded joints. 25. Meibomia. 
Vines. (-Apios is sometimes trifoliolate.) 
Style bearded; flowers all alike; podslinear. 23. Strophostyles. 
Style not bearded; some of the flowers apetalous. 24. Falcata. 
C. Leaves digitately 5-15 foliolate. 
Pods with several seeds, dehiscent. 4, Lupinus. 
Pods one-seeded, indehiscent. 18. Psoralea. 
D. Leaves odd-pinnate, 5—-many foliolate, (often only 1-3 leaflets in 
Phaca and Homalobus.) 
Trees or shrubs; flowers with 5 petals. 10. Robinia. 
Shrubs; flowers with but one petal, the keel and wings wanting. 
19. Amorpha. 
Vines; sometimes trifoliolate. 22. Apios. 
Herbs not climbing. 
Flowers in terminal spikes, heads or racemes. 
Pods 1-2-seeded, included in the calyx; wing and keel petals 
united to the stamen tube by their claws. 
Stamens 9-10, petals united to stamen tube only at its 
20. Parosela. 
ase. 
Stamens 5, petals united to stamen tube for its whole 
length. 21. Petalostemum. 
Pods elongated, exserted; seeds several; petals not united 
to the stamen tube. 11. Cracca. 
Flowers on axillary peduncles; pods short, sometimes inflated. 
Pods smooth; herbage not glandular punctate. 
Keel of the corolla blunt. 
Pod not flattened, one or both sutures intruded, mak- 
ing pods two-celled or cordate in cross_ section 
(round in some species). 16. Astragalus. 
Pods, one-celled, both sutures prominent externally. 
Pod inflated, membranous. 14. Phaca. 
Pods flat; flowers whitish or plant acaulescent. 
13. Homalobus. 
Keel pointed; plants acaulescent; pods in some species 
nearly two-celled. 12. Oxytropis. 
Pods prickly; foliage glandular dotted. 17. Glycyrrhiza. 
