STANDLEY TREES AND SHRUBS OF MEXICO. 1167 



Leaves ovate-cordate. 



Corolla campanulate 11. MELLICHAMPIA. 



Corolla rotate or nearly so. 



Corolla about 2 cm. long, the lobes linear. 



12. OXYPETALUM. 

 Corolla much smaller, the lobes broader than linear. 



13. ROULINIELLlA. 

 Pollinia borne in the upper part of the anther cell, erect or divaricate from 



the arms of the corpuscles. 

 Anther cells longitudinally dehiscent ; pollinia erect or nearly so. 



Plants erect 14. NEPHKADENIA. 



Plants scandent 15. MARSDENIA. 



Anther cells transversely dehiscent ; pollinia usually horizontal. 

 Corolla lobes with long barbate filiform terminal appendages. 



16. TRICHOSACME. 

 Corolla lobes not appendaged. 



Corolla campanulate or salverform. 



Corolla short-salverform 17. LACHNOSTOMA, 



Corolla broadly campanulate. 



Corolla long-hirsute within 18. MICRODACTYLON. 



Corolla not hirsute within. 



Corona lobes adnate to the corolla 19. DICTYANTHUS. 



Corona lobes free from the corolla 20. POLYSTEMMA. 



Corolla rotate. 



Stigma produced into a column 21. ROTHROCKIA. 



Stigma plane or depressed. 

 Corona entire or 5-lobate, the lobes not with lateral appen- 

 dages 22. VINCETOXICUM. 



Corona with 10 or more lobes, or the outer lobes witli filiform 

 lateral appendages. 

 Corolla covered within with linear-spatulate hairs; corona of 



15 scales 23. HIMANTOSTEMMA. 



Corolla lanate in the throat ; corona of 10 scales. 



24. UROSTEPHANUS. 



1. CRYPTOSTEGIA R. Br. in Liudl. Bot. Reg. pi. ^85. 1819. 



1. Cryptostegia grandiflora (Roxb.) R. Br. in Lindl. Bot. Reg. pi. J,35. 1819. 



Nerium grandifiorum Roxb. Hort. Beng. 19. 1814. 



Thoroughly naturalized in Sinaloa. Native of India. 



Woody vine, glabrous or nearly so ; leaves petiolate, oval to elliptic-ovate, 

 4.5 to 10 cm. long, obtuse or abruptly short-pointed, leathery ; flowers few, in 

 terminal cymes, pink or purplish ; calyx 5-parted, the lobes lanceolate ; corolla 

 funnelform, 5 to 7 cm. long; carpels divaricate, about 12 cm. long and 3.5 

 cm. thicli, acutely 3-angulate. " Clavel de Espafia," " hiedra," " cuaumecate 

 chayote " (Sinaloa). 



The milky juice yields rubber, and the plant has been cultivated in some 

 regions on that account. The rubber is said to be of good quality, but it is 

 produced only in small amounts. The stems are said to yield a good quality 

 of fiber. Cryptostegia madagascariensis Bojer, of Madagascar, the only other 

 species, is reported to be an important source of rubber, aud its bark furnishes 

 a useful fiber. 



