FAGACE^E 239 



Leaves 5-7-lobed, the lobes dentate, furnished with tufts of axillary 



hairs below. 4. Q. ellipsoidalis (A). 



Cup of the fruit deep cup-shaped to turbinate; leaves 5-9-lobed, the 



lobes toothed. 5. Q. coccinea (A, C). 



Cup of the fruit saucer-shaped. 



Leaves 5-9-lobed. 6. Q. palustris (A, C). 



Leaves 3-5-lobed. 7. Q. georgiana (C). 



Scales of the cup of the fruit more or less loosely imbricated, forming a free 



margin on its rim. 

 Leaves usually 7-lobed. 



Winter-buds tomentose. 8. Q. velutina (A, C). 



Winter-buds pubescent only at apex. 9. Q. Kelloggii (G). 



Leaves usually 3-5-lobed; winter-buds rusty pubescent. 10. Q. Catesbaei(C). 

 Leaves whitish or grayish tomentulose below. 



Leaves mostly acutely 5-lobed, pale or silvery white below. 1 1 . Q. ilicif olia (A) . 

 Leaves often dimorphous, 3-11-lobed, the lobes often falcate. 



12. Q. rubra(A,C). 



Leaves broad-obovate, often abruptly dilated at the wide obscurely lobed apex. 

 Leaves rounded or cordate at base. 



Lower surface of the leaves orange color or brownish, the upper scales of the cup 

 forming with several rows a thick rim on its inner surface, often reflexed. 



13. Q. marilandica (A, C). 



Lower surface of the leaves pale, the erect scales on the rim of the cup in a 

 single row. 14. Q. arkansana (C). 



Leaves cuneate at base. 



Leaves oblong-obovate. 15. Q. nigra (C). 



Leaves rhombic. 16. Q. rhombica (C). 



Leaves lanceolate-oblong or lanceolate-obovate, usually entire, involute in the 



bud. WILLOW OAKS. 

 Leaves glabrous. 



Leaves lanceolate to oblanceolate, deciduous in autumn. 17. Q. Phellos ( A, C) . 

 Leaves elliptic or rarely oblong-obovate, deciduous in the late winter. 



18. Q. laurifolia (C). 



Leaves tomentose or pubescent below, oblong-lanceolate to oblong-obovate. 

 Leaves pale blue-green, hoary tomentose below. 19. Q. cinerea (C). 



Leaves dark green, pubescent below. 20. Q. imbricaria (A). 



Leaves not deciduous in the autumn, revolute in the bud (convolute in 23). 



Leaves mostly persistent until after the appearance of those of the following year. 

 Leaves lanceolate, oblong-lanceolate or elliptic, pale and tomentose below. 



21. Q. hypoleuca (E, H). 



Leaves oval, orbicular to oblong, green and pubescent below; fruit maturing at 

 the end of the first season. 22. Q. agrifolia (G). 



Leaves persistent until their second summer or autumn. 



Leaves lanceolate to oval or oblong-lanceolate, entire or serrate; cup of the fruit 

 turbinate or tubular. 23. Q. Wislizenii (G). 



Leaves oval to oblong-obovate; cup of the fruit saucer-shaped or turbinate. 



24. Q. myrtifolia (C). 

 Stamens usually 6-8; styles dilated; abortive ovules basal or lateral; leaves persistent 



until their third or fourth season, involute in the bud. 



Leaves oblong, entire, dentate, or sinuate-toothed, fulvous-tomentose and ultimately 



pale on the lower surface; cup of the fruit usually thick. 25. Q. chrysolepis (G, H). 



Leaves oblong-lanceolate, crenate-dentate or entire, pubescent or tomentose below; 



cup of the fruit usually thin. 26. Q. tomentella (G). 



Fruit maturing at the end of the first season; shell of the nut glabrous on the inner surface 



