196 
FABACEAE. 
Pods not with two grooves on the upper side (or if slightly 
grooved, sessile). 
Pods with a fleshy epicarp, in fruit cross-ribbed; leaflets ob¬ 
scurely articulated to the rachis, fleshy, narrow. 
19. Ctenophyllum. 
Pods without fleshy epicarp; leaflets distinctly articulated to 
the rachis. 
Pods woody or at least leathery, flattened or slightly intruded 
on the lower side. 
Calyx cylindrical; flowers large; plant mostly low and 
cespitose. 18. Xylophacos. 
Calyx campanulate; flowers small. 
Corolla yellow; calyx-lobes linear-lanceolate, equalling 
the tube; stipules united; stem low. 
20. Cnemidophacos. 
Corolla purple; calyx-lobes triangular; much shorter than 
the tube; stipules free or nearly so; stem tall and 
slender. 21. Microphacos. 
Pods membranous, usually more or less flattened laterally, with 
both sutures prominent. 
Leaflets spinulose-tipped; pod 1-2-seeded. 
23. Kentrophyta. 
Leaflets not spinulose-tipped; pods several-seeded. 
24. Homalobus. 
Pods with two grooves on the upper side, stipitate. 
22. Diholcos. 
2. Keel (lower petals) produced into a beak. 27. Aragallus. 
II. Leaves digitately 3-foliolate. 
Flowers racemose. 26. Orophaca. 
Flowers capitate (some species of). 4. Trifolium. 
Tribe VII. GLYCYRRHIZEAE. 
One genus. 28. Glycyrrhiza. 
Tribe VIII. PSORALEAE. 
Petal 1 (standard) ; leaves odd-pinnate. 29. Amorpha. 
Petals 5. 
Wings and keel free from the filament-tube; leaves in our digitate. 
30. Psoralea. 
Wings and keel adnate to the filament-tube; leaves odd-pinnate. 
Stamens 9 or 10. 31. Parosela. 
Stamens 5. 32. Petalostemon. 
Tribe IX. IiEDYSAREAE. 
Pod 4-several-seeded, neither spiny nor toothed. 33. Hedysarum. 
Pod 1-2-seeded, more or less spiny or toothed. 34. Onobrychis. 
Tribe X. VICIEAE. 
Style filiform, hairy all around and below the apex; stamen-tube usually oblique 
at the summit. 35. Vicia. 
Style flattened towards the apex, hairy on the inner side; stamen-tube usually 
truncate or nearly so. 36. Lathyrus. 
1. SOPHORA L. 
1. Sophora sericea Nutt. Dry prairies from S. D. and Wyo. to Tex. and 
Ariz.—Alt. 4000-7000 ft.—New Windsor, Weld Co.; Colorado Springs; Ft. 
Collins; mesas near Pueblo; Walsenburg; Poudre Flats; Trinidad; Boulder; 
Colorado City. 
