402 CONTRIBUnONS FROM THE NATIONAL HERBARIUM. 



Leaflets 3 to 5 pairs. 



Leaflets acute, usually glabrous 24. C. laevigata. 



Leaflets obtuse or rounded at the apex, often pubescent. 



Leaflets densely sericeous 25. C. argentea. 



Leaflets glabrous or nearly so 26. C. bicapsularis. 



AA. Fruit strongly compressed, flat, not articulate, or if articulate not 

 much constricted between the seeds. 

 B. Gland present between the lowest pair of leaflets, large and con- 

 spicuous. 



Fruit breaking into 1-seeded joints 27. C. skinneri. 



Fruit not jointed. 

 Leaflets 2 or 3 pairs. 



Fruit linear-oblong, about 12 mm. wide 28. C. purpusi. 



Fruit linear, less than 8 mm. wide. 



Anthers erostrate 29. C. botteriana. 



Anthers partly rostrate. 

 Interior sepals 12 mm. long; plants usually pubescent. 



30. C. leiophylla. 

 Interior sepals 6 mm. long; plants glabrous. 



31. C. holwayana. 

 Leaflets 4 to 40 pairs. 



Leaflets 18 to 40 pairs, linear-oblong 32. C. multijuga. 



Leaflets 4 to 15 pairs, usually broader. 



Leaflets small, 4 to 6 mm. long 33. C. polyphylla. 



Leaflets 7 to 20 mm. long or longer. 

 Petals about 7 mm. long; flowers in long racemes; leaflets 



densely pilose beneath 34. C. chiapensis. 



Petals 15 to 20 mm. long or larger; flowers clustered or in 

 vei-y short few-flowered racemes ; leaflets usually 

 glabrous or sparsely pubescent. 



Leaflets acuminate 35. C. tonduzii. 



• Leaflets rounded or very obtuse at apex. 



Leaflets oblong, 9 to 12 pairs 36. C. quiedondilla. 



Leaflets obovate to oval, usually 4 to 8 pairs. 



37. C. biflora. 

 BB. Glands none or minute and inconspicuous. 



Leaflets 1 pair 38. C. unijuga. 



Leaflets 3 to 15 pairs. 



Leaflets small, 3 to 7 mm. wide or narrower. 

 Fruit winged on the margins. 



Leaflets 4 to 7 pairs, obovate-oval 39. C. galeottiana. 



Leaflets 8 to 14 pairs, elliptic-oblong 40. C. polyantha. 



Fruit not winged. 



Fruit 9 to 15 cm. long, the valves thin 41. C. wislizeni. 



Fruit 14 to 25 cm. long, the valves thick 42. C. pringlei. 



Leaflets large, 1 to cm. wide or larger. 



Valves of the fruit winged 43. C. alata. 



Valves of the fruit not winged. 

 Leaflets 3 to 5 pairs. 



Leaflets acute or acutish, soft-pubescent beneath. 



44. C. atomaria. 

 Leaflets rounded or very obtuse at the apex. 



Leaflets oblong 45. C. peralteana. 



lieaflets oval, oval-ovate, or rounded. 



