2882 



QUERCUS 



QUERCUS 



E. Longest lobe of the If. about 

 equaling the breadth of the 

 broadish middle portion of 



the If 1. rubra 



EE. Longest lobes of the If. 2-6 

 times as long as the narrow 

 middle portion. 

 F. Upper scales of cup closely 

 oppressed: Ivs. glabrous: 

 winter buds glabrous or 

 puberulous. 



G. Cup brown, glabrous or 

 puberulous and gla- 

 brate. 



H. Shape of cup flat, sau- 

 cer-like: Ivs. usually 



cuneate at base 2. palustris 



HH. Shape of cup hemis- 

 pherical or turbi- 

 nate: Ivs. usually 



nearly truncate 3. coccinea 



GG. Cup grayish or pale 



brown, pubescent. 

 H. Acorn about %in. 

 thick: cup %-l in. 



broad 4. Schnecldi 



HH. Acorn about %in. 

 thick: cup Yy-%in. 



broad 5. ellipcoidalis 



FF. Upper scales o 1 / cup 



loosely imbricate. 

 G. Winter buds puberulous 

 or glabrous: acorn 1 



1^4 in- long 6. 



GG. Winter buds tomentose: 



Kelloggii 



acorn }s2-%in. long. . . 7. velutina 



DD. Lobes of Ivs. entire or few- 

 toothed: under side whitish 

 or grayish tomentose. 

 E. Plant a tree: lobes elongated, 



usually falcate. 

 F. Under side of Ivs. tawny or 



grayish pubescent 8. falcata 



FF. Under side of IDS. white- 



tomentose 9. pagodaefolia 



EE. Plant a shrub: lobes broadly 



triangular 10. ilicifolia 



cc. Lvs. obovate, 3-5-lobed at the apex 



or almost entire, short-stalked.. 

 D. Shape of Ivs. obovate-spatulate: 



Ivs. glabrous 11. nigra 



DD. Shape of Ivs. broadly obovate: Ivs. 



rusty pubescent beneath 12. marilandica 



ccc. Lvs. oblong or linear-oblong, entire, 



rarely remotely toothed. 

 D. Under side of Ivs. glabrous. 

 E. Lvs. lanceolate or linear- 

 oblong, light green above, 



acute 13. Phellos 



EE. Lvs. oblong, dark green above. 14. laurifolia 

 DD. Under side of Ivs. brownish 



pubescent 15. imbricaria 



BB. Walls of nut glabrous on the inner 

 surface (except Nos. 41, 4)'- Ivs. 

 sinuately lobed or toothed, not bris- 

 tle-tipped, rarely serrate with 

 bristly teeth; the evergreen Ivs. some- 

 times entire: fr. ripening the first 

 year (except Nos. 16, 37, 41, 42). 

 WHITE OAKS. (Lepidobalanus.) 

 c. Foliage deciduous. 



D. Lvs. sinuately dentate or serrate. 

 E. Scales of cup linear or lanceo- 

 late, spreading and recurved. 

 F. Margin of Ivs. serrate: Ivs. 



white-tomentose beneath. . 16. variabilis 

 FF. Margin of Ivs. obtusely den- 

 tate, pubescent beneath 17. dentata 



EE. Scales of cup oppressed, im- 

 bricate. 



F. Petioles very short: Ivs. 

 usually auriculate at 

 base, glabrous or nearly 



so beneath 18. mongolica 



FF. Petioles rather slender: Ivs. 

 cuneate or rounded at the 

 base. 



G. Lobes of Ivs. acute or 

 acutish (sometimes ob- 

 tusish in No. 20). 

 H. Fr. peduncled: Ivs. 

 silky-pubescent be- 

 neath 19. glandulifera 



HH. Fr. sessile or nearly 

 so: Ivs. lomentulose 

 beneath. 

 i. Teeth 7-15 on each 



side of If.: trees. 

 3. Petiole stout, %- 

 %in. long ; 

 pairs of veins 

 10-15; base of 

 If. often 



rounded 20. aliena 



Jj. Petiole slender , 

 %-l in. long; 

 pairs of veins 

 7-1 3; base of If. 



cuneate 21. Muhlen- 



II. Teeth 3-7 on each [bergii 



side: shrub 22. prinoides 



QG. Lobes of Ivs. rounded. 

 H. Peduncle of fr. short 



or almost none. 

 i. Under side of Ivs. 

 whitish or grayish 



tomentose 23. Prinus 



II. Under side of Ivs. 

 pubescent or near- 

 ly glabrous, pale 



greenish 24. montana 



HH. Peduncle much longer 

 than petiole: Ivs. 

 tomentulose beneath. 25. bicolor 

 DD. Lvs. pinnately lobed. 



E. Bark separating in thin 

 scales, light gray or light 

 brown. American species. 

 F. Under side of Ivs. pubescent 



or tomentose. 



G. Length of Ivs. 5-8 in.: 



Ivs. lyrate-pinnatifid. 



H. Cup fringed by awned 



scales 26. macrocarpa 



HH. Cup not fringed. 



i. Fr. peduncled: Ivs. 

 white-torn entose 



beneath 27. lyrata 



II. Fr. nearly sessile: 

 Ivs. pubescent be- 

 neath 28. stellata 



GG. Length of Ivs. 2-6 in. 

 H. Upper surface of Ivs. 

 glabrous and lus- 

 trous 29. Garry ana 



HH. Upper surface of Ivs. 

 pubescent and dull: 

 acorn elongated, to 



2% in. long 30. lobata 



FF. Under side of Ivs. glabrous. 31. alba 

 EE. Bark furrowed and ridged, 

 not scaly, usually dark 

 brown or dark gray. Euro- 

 pean species. 



F. Cup with imbricate, op- 

 pressed scales. 

 G. Lrs. glabrous below. 

 H. Petioles shorter than 



peduncles 32. Robur 



HH. Petioles longer than 



peduncles 33. sessiliflora 



GG. Lvs. pubescent below. 

 H. Scales of cup small, 

 closely oppressed: 



Ivs. usually lobed 34. lanuginoss 



HH. Scales oblong to lance- 

 olate, loosely op- 

 pressed: Ivs. usually 

 pinnatifid. 



i. Petiole %-%in. 

 long: fr. nearly 



sessile 35. Toza 



ii. Petiole short: fr. 



stalked ... . . 36. conf erta 



