STANDLEY TREES AND SHRUBS OF MEXICO. 401 



Fruit elastically bivalvate. Anthers dehiscent by short terminal slits. 



Flowers mostly in terminal racemes, sometimes also in the upper axils ; plants 

 hispid or viscid-pubescent, or both. 

 Petioles equaling or slightly longer than the rachis ; leaflets oval to oblong 



or obovate 1. C. pauciflora. 



Petioles usually twice as long as the rachis or longer; leaflets rounded- 

 obovate or suborbicular. 

 Fruit hispid with long spreading hairs ; plants prostrate or procumbent. 



2. C. hispidula. 

 Fruit pilose with short appressed hairs ; plants erect— 3. C. enneandra. 

 Flowers solitai-y or clustered iu the axils ; plants neither hispid nor viscid. 



Leaflets 2 or 4 4. C. diphylla. 



Leaflets more than 2. 

 Leaflets 3 or 4 pairs. 



Venations of the leaflets conspicuously reticulate 5. C. greggii. 



Venation of the leaflets not reticulate 6. C. macdougaliana. 



Leaflets numerous pairs. 



Costa of the leaflet very close to the margin 7. C. cinerea. 



Costa of the leaflet remote from the margin. 



Stems glabrate or puberulent 8. C. flexuosa. 



Stems pilose with spreading hairs 9. C. picachensis. 



Fruit indehiscent or dehiscent, never elastically bivalvate. 

 Gland of the petiole borne at the base of the petiole. 



Fruit 15 to 25 cm. long, 2 to 3 mm. wide 10. C. leptocarpa. 



Fruit 7.5 to 12.5 cm. long, 5 to 8 mm. wide 11. C. occidentalis. 



Glands borne between the leaflets or none. 



Anthers partly dehiscent by basal pores, pubescent 12. C. grandis. 



Anthers all dehiscent at or near the apex, usually glabrous. 

 A. Fruit turgid, terete, subterete, tetragonous, or articulate-compressed 

 and strongly constricted between the seeds. 

 Seeds longitudinal. 



Plants glabrous or nearly so; leaflets usually 3 pairs 13. C. tora. 



Plants sericeous or stellate-tomentose ; leaflets 3 to 5 pairs. 



Plants sericeous 14. C. ornithopoides. 



Plants stellate-tomentose 15. C. villosa. 



Seeds transverse. 

 Leaflets 2 pairs. 



Racemes axillary, much shorter than the leaves. 



Leaflets glabrous 16. C. inaequilatera. 



Leaflets pubescent beneath. 



Leaflets obtuse 17. C. berlandieri. 



Leaflets acute 18. C. densiflora. 



Racemes mostly arranged in a large terminal panicle. 



Leaflets densely pubescent beneath 19. C. oxyphylla. 



Leaflets glabrous beneath or obscurely puberulent. 



Gland present between the lowest pair of leaves; stipules 



setaceous 20. C. fruticosa. 



Glands present between both pairs of leaflets ; stipules lanceo- 

 late 21. C. undulata. 



Leaflets 3 or more pairs. 

 Leaflets 6 to 18 pairs. 



Leaflets 6 to 8 pairs, rounded at apex, tomentose beneath. 



22. C. tomentosa. 

 Leaflets 8 to 15 pairs, acute, glabrous 23. C. spectabilis. 



