STANDLEY TREES AND SHRUBS OF MEXICO. 611 



Petals rudimentary or absent in one or botli kinds of flowers. 

 Petals rudimentary or absent in botli Ixinds of flowers. 



Flowers monoecious 4. C. tenuilobus. 



Flowers dioecious. 



Stamiaate racemes long-pedunculate; capsule densely lepidote with short- 

 rayed scales 5. C. neomexicanus. 



Stamiuate racemes sessile or short-pedunculate; capsule covered with 

 long-rayed scales. 

 Staminate racemes very short, few-flowered ; leaves long-petiolate. 



6, C. californicus. 

 Staminate racemes elongate, many-flowered ; leaves short-petiolate or 



subsessile 7. C. dioicus. 



Petals well develoi^ed in the staminate flowers, rudimentary or obsolete in the 

 pistillate ones. 

 Racemes interrupted, the pistillate portion separated from the staminate 

 by a long sterile portion. Leaves dentate. 



Leaves obovate-oblong, acute at base 8. C. meissneri. 



Leaves broadly ovate, rounded or subcordate at base 9. C. liebmanni. 



Kacemes continuous. 



LoM-est bracts of the racemes subtending both staminate and pistillate 

 flowers. 

 Glands none on the leaves. 



Leaves acuminate, denticulate 10. C. stipulaceus. 



Leaves obtuse or abruptly short-pointed at apex, entire. 



11. C. suberosus. 

 Glands present on the lower surface of the leaf near the base. 

 Styles divided to the base, the branches laciniate or bifid. 

 Leaves obscurely 5-nerved or often pinnate-nerved, rhombic- 

 lanceolate 12. C. grewiaefolius. 



Leaves conspicuously palmate-nerved, broadly ovate. 



13. C. gossypiifolius. 

 Styles divided to the base, the branches, however, entire. 



Stipules subulate 14. C. panamensis. 



Stipules ovate or lance-ovate 15. C. draco. 



Lowest bracts subtending only pistillate flowers. 

 Pubescence of scalelike hairs. 



Leaves densely lepidote on the upper surface 16. C. amphileucus. 



Xicaves glabrate on the upper surface. 



Leaves obtuse or rounded at apex 17. C. hypoleucus. 



Leaves long-acuminate 18. C. watsonii. 



Pubescence of stellate hairs. 

 A. Stipules glandular-laciniate or glandular-denticulate. 

 Pubescence of closely appressed, depressed hairs. 



Leaves glandular-ciliate 19. C. jucundus. 



Leaves not glandular-ciliate. 



Styles once dichotomus 20. C. adspersus. 



Styles 2 or more times dichotomus 21. C. soliman. 



Pubescence of loose spreading hairs. 



Styles once dichotomous, the branches entire. 



Stipules pinnately lobate 22. C. incanus. 



Stipules palmately lobate 23. C. suaveolens. 



