STANDEE Y TREES AND SHRUBS OF MEXICO. 1279 



Corolla red, purple, or yellow, somewhat ampliate above, contracted at the 

 mouth. 



Calyx lobes very short, obtuse. Corolla yellow, glabrous 1, C. flavescens. 



Calyx lobes usually elongate, acute to attenuate. 

 Corolla glabrous. 



Leaves glabrous beneath 2. C. endlicheri. 



Leaves tomentose or villous beneath. 



Calyx glabrous 3. C. purpureum. 



Calyx villous 4. C. roseum. 



Corolla puberulent or, villous outside. 



Corolla lobes broadly ovate or deltoid, short, erect 5. C. fasciculatum. 



Corolla lobes lance-oblong, elongate, spreading 6. C. benthami. 



Corolla usually white or greenish, the tube gradually broadened from base 

 to apex, not contracted at the mouth. 

 Filaments appendaged at the point of insertion. 

 Leaves tomentose, pubescent, or puberulent beneath. 

 Pubescence of stellate hairs. 



Corolla more than twice as long as the calyx 7. C. lanatum. 



Corolla less than twice as long as the calyx 8. C. pacificum. 



Pubescence of simple hairs. 



Corolla tube 8 to 10 mm. long 9. C. dumetorum. 



Corolla tube 18 mm. long 10. C. hirtellum. 



Leaves glabrous beneath. 



Leaves coriaceous, mostly 5 to 8 cm. wide 11. C. laurifolium. 



Leaves thin or only slightly coriaceous, mostly less than 5 cm. wide. 

 Calyx 4 to 6 mm. long. 



Corolla 20 to 26 mm. long 12. C. oblongifolium. 



Corolla 15 mm. long 13. C. pedunculare. 



Calyx 2 to 3 mm. long 14. C. noctumum. 



Filaments not appendaged. 



Tube of the corolla twice as long as the calyx or shorter. 



Calyx 10 to 15 mm. long 15. C. fulvescens. 



Calyx 8 mm. long or less. 



Calyx villous or tomentose 16. C. confertiflorum. 



Calyx glabrous. 



Calyx 4 mm. long 17. C. anagyris. 



Calyx 6 to 8 mm. long , 18. C. thyrsoideum.. 



Tube of the corolla usually more than 3 times as long as the calyx. 



Corolla 8 to 12 mm. long; stigma short-exserted 19. C. diurntim. 



Calyx 14 to 25 mm. long or larger; stigma usually included. 



Calyx 2 to 2.5 mm. long 20. C. viride. 



Calyx 4 to 6 mm. long. 

 Leaves thick, the lateral nerves nearly obsolete; corolla brownish 



or rufescent when dry 21. C. laxum. 



Leaves thin, the lateral nerves conspicuous beneath ; corolla greenish 

 when dry 22. C. nitidum. 



1. Oestrum, flavescens Greenm. Proc. Amer. Acad. 34: 572. 1899. 



TjTpe from Cuernavaca, Morelos, altitude 1,500 meters. 



Shrub, about 1 meter high ; leaves slender-petiolate, oblong-ovate to rounded- 

 ovate, 3 to 5 cm. long, acuminate to very obtuse at apex; flowers pedicellate; 

 caly^ 5 mm. long, glabrous ; corolla 2 to 2.5 cm. long, orange. 



