338 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Stamens 9 or 10. 

 Corolla of 5 petals. 



Pods not falcate; petals 

 very unequal; herbs 



or low shrubs 15. Parosela (p. 350). 



Pods falcate; petals nearly- 

 equal; tall shrub 12. Viborqxtia (p. 349). 



Corolla of less than 5 petals. 



Petals 1, the banner. . . 13. Amorpha (p. 349). 



Petals wanting 14. Parryella (p. 350). 



Foliage not glandular-punctate. 

 Leaves 3-foliolate. 

 Leaflets entire or merely undu- 

 late. 

 Shrub; flowers scarlet; stems 



spiny 28. Erythrina (p. 376). 



Herbs; flowers not scarlet; 

 stems not spiny. 



Leaflets 4 or more 9. Anisolotus (p. 346). 



Leaflets 3 10. Acmispon (p. 348). 



Leaflets more or less toothed. 

 Poda curved or coiled; flowers 



racemose 6. Medicago (p. 343). 



Pods straight; flowers racemose 

 or capitate. 

 Leaves pinnate ; valves of the 

 pod leathery; flowers in 



racemes 7. Melilotus (p. 343). 



Leaves digitate; pod valves 



thin; flowers in heads. . 8. Trifolium (p. 344). 

 Leaves several to many-foliolate. 

 Shrubs or small trees; stems 



spiny; flowers pink 18. Robinia (p. 356). 



Herbs, at most woody only at 

 the base; stems sometimes 

 epiny; variously colored. 

 Stipules spiny ; leaflets wan t- 

 ing or flowers early de- 

 ciduous 17. Peteria (p. 356). 



Stipules not spiny; leaflets 

 persistent. 

 Keel prolonged into a beak 20. Oxytropis (p. 370). 

 Keel not prolonged into a 



beak 19. Astragalus (p. 356). 



1. THERMOPSIS R. Br. 



Coarse perennial herbs with palmately 3-foliolate leaves; flowers 1 cm. long or more 

 bright yellow, racemose; pods flat, several-seeded; stems 30 to 50 cm. high, sparingly 

 appressed-pubescent. 



KEY TO the species. 



Pods erect, straight 1. T. pinetorum. 



Pods spreading, arcuate 2. T. divancarpa. 



