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. Kentfophyta. 

 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. zT. Aeagallus. 

 IL Leaves digitately 3-foliolate. 



Flowers racemose. 26. Orophaca. 



Flowers capitate (some species of). 4. Trifolium. 



Tribe VIL GLYCYRRHIZEAE. 

 One genus. 28. Glycyrrhiza. 



Tribe VIIL 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. 



