52 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Ovules 7 or 8; leaflets scarcely reticulate beneath. Standard not yellow-spotted. 
Leaflets 7, ovate, obtuse; petals purplish, shading to white at the base; 
standard 13 mm. long...................---...6- 16. L. oaxacensis. 
Leaflets 1 to 5, oblong, acutely acuminate; petals pink, lineolate; standard 
ll mm. long..... 22... 22.0.2 2c cece cee een ee 17. L. lineatus. 
Leaves glabrous. 
Leaves 1-foliolate. Standard ovate-oblong.............. 18. L. unifoliolatus. 
Leaves plurifoliolate. 
Legume cochleate, 1 to 3-seeded, the stipe and margins dark-colored. Leaf- 
lets 5 to 9......2..2 2.222 eee eee cece eee ee eeee 19. L. cochleatus. 
Legume flat. 
Leaflets 5 or fewer, long and acutely attenuate-acuminate; legume 1 or 
2-seeded .........2....2-02222--2-----2--2-+-- 20. L. caudatus. 
Leaflets 5 or more, obtuse or shortly and obtusely acuminate; ovary 4 to 
6-ovulate. 
Flowers small or medium-sized, the standard not over 13 mm. long. 
Large tree; flowers small, greenish purple, the standard not 
over 7.5 mm. long; legume thin, membranous, 1 or 2- 
seeded; terminal leaflet up to 23 cm. long. 
21. L. latifolius. 
Shrub; flowers medium-sized or large, lavender, minutely yel- 
low-spotted, the standard up to 13 mm. long; leaflets not 
over 12 mm. long................. 22. L. darienensis. 
Flowers largest in the genus, white and purple, the standard 15 to 
18.5 mm. long. 
Calyx minutely darkish-pubescent; leaflets subacute at the 
base, the petiolules 10 mm. long, the blades oblong, up 
to 9 cm, long.................... 23. L. megalanthus. 
Calyx densely silvery-pubescent; leaflets broadly rounded at 
the base, the petiolules 7 mm. long or less, the blades 
ovate, up to 11 cm. long........... 24. L. mexicanus. 
Subgenus 2. NEUROSCAPHA. 
Series 2. PUBIFLORI. 
Standard silky-pubescent, up to 5.5 mm. long, the wings and keel glabrous; carinal 
petals auriculate. Leaves 7 to 13-foliolate............ 25. L. minimifiorus. 
Standard and petals slightly pubescent; carinal petals not auriculate. 
Leaves entirely glabrous, 5 to 9-foliolate. Legume slender-stipitate, up to 10 
cm. long and 1 cm. broad, flat, glabrous........ 26. L. atropurpureus. 
Leaves more or less pubescent. 
Leaves 9 to 15-foliolate. Base of calyx, wings, and carinal petals sparsely 
yellow-dotted; legume cochleate, thin, glabrous, up to 3.5 cm. long 
and 0.9 cm. broad...........2.....000.2 cece eee 27. L. lanceolatus. 
Leaves 5 or 7-foliolate. 
Calyx densely gray-pubescent; petiolules broadly canaliculate; leaflets 
broadly obtuse-acuminate, usually 5, opaque. 
28. L. yucatanensis. 
Calyx ferruginous-pubescent; petiolules narrowly canaliculate; leaflets 
mostly 7, acute at the apex, punctate.......... 29. L. orotinus. 
