544 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Leaflets crenate. 

 Leaflets 11 to 35. 



Leaflets 2 to 4 cm. long, narrowly lanceolate 4. E. multijugum. 



Leaflets 1 to 1.5 cm. long, oblong 5. E. karwinskii. 



Leaflets 3 to 7. 



Leaflets rounded or obtuse at apex 1. E. subtrifoliatum. 



Leaflets acute or acuminate. 



Lateral nerves of the leaflets very numerous (about 20) and promi- 

 nent 6. E. kerberi. 



Lateral nerves few, not conspicuous. 



Leaflets acuminate 7. E. lancifolium. 



Leaflets merely acute 8. E. trijugum. 



Leaflets entire. 



Leaflets small, about 1 cm. long 9. E. schafEneri. 



Leaflets large, 3 to 12 cm. long or larger. 



Ovary and fruit pubescent 10. E. grandifolium. 



Ovary and fruit glabrous. 



Leaflets densely tomentose at maturity ;_11. E. heterophyllum. 



Leaflets glabrous at maturity or thinly pilose or puberulent. 



Leaflets glaucescent beneath, with very prominent, reticulate vena- 

 tion 12. E. long'ipes. 



Leaflets green beneath, the venation not prominent. 



13. E. simaruba. 

 Petiole and rachis winged, sometimes very narrowly so. 

 Leaves bipinnate. 



Leaflets large, usually 1 to 2.5 cm. long. 



Leaflets rounded at base 14. E. diversifolium. 



Leaflets acute at base 15. E. collinum. 



Leaflets small, most of them much less than 1 cm. Icng. 



Leaflets coriaceous, densely pilose beneath ; calyx lobes shorter than the 



petals 16. E. gracile. 



Leaflets comparatively thin, glabrous or nearly so; calyx lobes equaling 



or longer than the petals 17. E. bipinnatum. 



Leaves once pinnate. 

 Leaflets entire, never tomentose. 



Leaflets linear, oblong, or rarely oval, 3 mm. wide or narrower. 



Leaflets 5 to 9. Young branches pubescent 18. E. aridurii. 



Leaflets more than 9 in all or most of the leaves. 



Leaflets linear-oblong to oval 19. E. micropliyllum. 



Leaflets narrowly line.tr 20. E. galeottianum. 



Leaflets lanceolate to broadly ovate or oval-elliptic, most of them more 



than 5 mm. wide 21. E. odoratum. 



Leaflets crenate or serrate, oi', if entire, densely tomentose. 



Leaflets glabrous beneath when mature, or pubescent only along the costa. 



Leaflets about 25, linear-lanceolate 22. E. pring'lei. 



Leaflets 3 to 15. 



Leaflets long-attenuate or long-acuminate at apex. 



Teeth of the leaflets very large and coarse 23. E. penicillatum. 



Teeth of the leaves very small and appressed. 



Leaflets 3 or 5 25. E. tecomaca. 



Leaflets usually 7 to 15. 



Leaflets 7 or 9 ; inflorescence sessile or nearly so. 



21. E. odoratum. 

 Leaflets 11 to 15; inflorescence slender-pedunculate. 



26. E. rubrum. 



