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 i-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 i (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. HEDYSAREAE. 



Pod 4-several-seeded, neither spiny nor toothed. 33. HEDYSARUM. 



Pod i-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. 



i. SOPHORA L. 



i. 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. 



