512 COISTTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



55. LONCHOCARPUS H. B. K. Nov. Gen. & Sp. 6: 383. 1823. 



Reference: Pittier, Contr. U. S. Nat. Herb. 20: 37-93. pi. 1-6. f. 1-^3. 1917. 

 Unarmed trees or shrubs ; leaves pinnate ; flowers often large and showy, 

 racemose or paniculate ; fruit compressed, thin or thiclr, indehiscent. 



Same species are used in South America as fish poisons. The leaves of some 

 are said to have irritant and vomitive properties. 



Leaves unifoliolate 1. L. unifoliolatus. 



Leaves with 3 or more leaflets. 



Leaflets glabrous beneath or when young sparsely pilose along the costa. 

 Pedicels mostly longer than the calyx ; leaflets and calyx punctate. 



Plants wholly glabrous 2. L. longistylus. 



Plants sparsely pubescent on the inflorescence and the costa of the leaflets. 



3. L. longipedicellatus. 

 Pedicels shorter than the calyx ; leaflets and calyx not punctate. 



Fruit cochleate; leaflets .5 to 9 4. L. cochleatus. 



Fruit flat ; leaflets 3 or 5, rarely 7. 



Flowei-s about 1 cm. long 5. L. hondurensis. 



Flowers about 1.5 cm. long. 



Leaflets 6 to 9 cm. long, acutish 6. L. megalanthus. 



Leaflets 9 to 11 cm. long, cuspidate-acuminate 7. L. mexicanus. 



Leaflets more or less pubescent beneath over the whole surface. 

 Leaflets acute or acutish at apex, or abruptly apiculate. 

 Leaflets small, most of them 3 to 5 cm. long, the upper ones acute at base. 

 Standard densely sericeous ; keel petals auriculate. 



8. L. minimiflorus. 

 Standard thinly sericeous ; keel petals not auriculate. 



Leaflets 9 to 15 9. L. lanceolatus. 



Leaflets 5 or 7 10. L. yucatanensis. 



Leaflets large, most of them 6 to 12 cm. long, usually rounded or very 

 obtuse at base. 

 Leaflets 5 or 7. 



Leaflets cuspidate-acuminate 11. L. caudatus. 



Leaflets very short-acuminate. 

 Lateral nerves of the leaves very conspicuous and prominent be- 

 neath ; calyx conspicuously dentate 12. L. oaxacensis. 



Lateral nerves inconspicuous; calyx subtruncate. 



Calyx densely sericeous 13. L. guatemalensis. 



Calyx glabrous or nearly so 14. L. purpusii. 



Leaflets 9 or more in most of the leaves. 



Lateral nerves of the leaflets 10 to 12 15. L. affinis. 



Lateral nerves of the leaflets 5 to 8. 



Standard petals 16 to 18 mm. long 16. L. palmeri. 



Standard 10 to 14 mm. long. 



Leaflets finely sericeous beneath 17. L. robustns. 



Leaflets scaberulous-puberulent beneath 18. L. sericeus. 



Leaflets rounded or very obtuse at apex, never apiculate, often emarginate. 

 Venation of the leaflets not impressed on the upp.er surface. 

 Pubescence of the calyx brown ; leaflets 1.5-3 cm. long. 



19. L. comitensis. 

 Pubescence of the calyx gray or whitish ; leaflets mostly more than 3 

 cm. long. 



Leaflets oval : 20. L. constrictus. 



Leaflets oblong 21. L. emarginatus. 



