14 MISC. PUBLICATION 477, U. S. DEPT. OF AGRICULTURE 



7. Leaves basally cordate, with short spreading creamy tomentum be- 

 neath, veins 11 to 15 on each side 15. Q. ptjrulhana. 



7. Leaves basally cuneate to subobtuse, appressed-canescent beneath, 



veins 6 to 8 on each side 19. Q. oleioides. 



6. Leaves glabrate or pubescent beneath but not with short dense tomentum 

 or appressed stellate hairs. 



8. Leaves completely glabrate. 



9. Leaves long-acuminate, entire, cup scales tomentose at base only, 

 the apices glabrous, thin, and loosely appressed. 



8. Q. PANAMANDINAEA. 



9. Leaves not acuminate, or if so then coarsely toothed, cup scales 

 pubescent all over. 

 10. Leaves oblanceolate or lanceolate, attenuate, coarsely several- 

 toothed above the middle. 

 11. Petioles 1 to 4 mm. long 5. Q. pilarius. 



11. Petioles 15 to 40 mm. long 6. Q. corrugata. 



10. Leaves typically oblong or lance-elliptic, abruptly acute or obtuse, 



coarsely few-toothed toward the apex or entire. 



12. Leaves cuneate at base, glossy beneath, fruit large (cups over 



20 mm. broad), solitary or paired 7. Q. boqueronae. 



12. Leaves broadly rounded or cordate at base, glaucous and dull 

 beneath, fruit small (cups 10 to 14 mm. broad), clustered. 



18. Q. sebifera. 

 8. Leaves villous or tomentose beneath or at least the midrib strigose or 

 stellate-tomentose. 

 13. Fruit large (acorns 2.5 to 3 cm. broad). 



14. Leaves obovate to elliptic-oblanceolate, not markedly tapering, 

 the base rather broad, cuneate to cordate, obscurely low- 

 toothed, petioles 6 to usually 10 or 12 mm. long. 



3. Q. DAVIDSONIAE. 



14. Leaves oblanceolate, tapering to the cuneate or narrowly rounded 



base, coarsely toothed above the middle, petioles 3 to 5 



mm. long 4. Q. oocarpa. 



13. Fruit smaller (acorns rarely as much as 2 cm. broad at maturity). 



15. Leaves very thick and leathery, markedly impressed-veiny above, 



evidently reticulate-veiny beneath, strongly cordate, sparsely 



tomentose beneath 17. Q. pilicaulis 



15. Leaves relatively thin, veins not markedly impressed above nor 

 evidently reticulate beneath, or if leaves thick and impressed- 

 veiny above then persistently and densely long-tomentose 

 beneath or not cordate. 

 16. Leaves waxy-glaucous beneath. 



17. Petioles 15 to 25 (rarely only 10) mm. long, leaves ovate 

 to elliptic, entire or apically few-toothed, very promi- 

 nently veiny beneath 10. Q. polymorpha. 



17. Petioles not over 7 mm. long, leaves narrowly oblong or the 

 whole margin toothed. 



18. Leaves ovate to oblanceolate 14. Q. peduncularis. 



18. Leaves oblong to lanceolate 16. Q. vicentensis. 



16. Leaves not waxy-glaucous beneath or this obscured by loose long 

 tomentum. 

 19. Leaves thick, impressed-veiny above and usually loosely 



long-tomentose beneath 14. Q. peduncularis. 



19. Leaves if thick not markedly impressed-veiny above, glabrate 



or merely villous or sparsely tomentose beneath, the 



pubescence in no case obscuring the surface. 



20. Leaves regularly and usually repandly 10- or 12-toothed 



on each side corresponding to the veins, or merely 



erosely crenate. 



21. Leaves rather thick and quite leathery, erosely crenate, 



drying yellowish-brown 13. Q. segoviensis. 



21. Leaves thin, usually regularly round- or acute-toothed, 

 drying green. 



14a. Q. peduncularis var. sublanosa. 

 20. Leaves entire or irregularly few-toothed above the middle. 



