96 
Terminal scales of the cup awned, forming a fringe 
around the cup, rarely wanting................ 4 Q. macroecarpa. 
*Leaves with sharp or rounded teeth, sometimes 
somewhat lobed in No. 5. 
Fruit peduncled. 
Peduncles exceeding the petioles................... 5 Q. bicolor. 
Peduncles equaling or shorter than the petioles. 
1 Bieeliplics GR key (areca tale eats oe Noe ae near ts a St aie 6 Q. Michauxii. 
Barkeclosevand funrowedereer set ee een 7 Q. Prinus. 
Fruit sessile or on very short peduncles............ 8 Q. Muhlenbergii. 
Bark dark, furrowed; leaves with bristle tips; fruit ma- 
turing the second year. 
**Leaves more or less deeply lobed, the lobes or teeth 
conspicously bristle pointed. 
Mature leaves green and smooth beneath, except tufts 
of hairs in the axils, somewhat regularly lobed. 
Leaves lobed to about the middle, lobes wedge- 
shaped, broadest at the base; cup saucer-shaped; 
nut about: 2 em. @4inch); broad). 25...-5..-...- 9 Q. rubra. 
Leaves lobed to beyond the middle, rarely a few not 
so deeply lobed, at least some of the lobes broad- 
est at the apex. 
Cup saucer-shaped, rarely enclosing the nut for 
more than 1/3 its length. 
Leaves glossy above; cup about 1-1.5 em. (about 
A ZprcraVl ay) ia] ORROLMG ints Alero eons Mose ood GG Baan ce 10 Q. palustris. 
Leaves dull above; cup 1.5-2.5 cm. (about 34 
ITCH) SOT OMG Se eae hy ees eee mcr nase 11 Q. Schneckii. 
Cup hemispheric or top-shaped, generally enclos- 
ing the nut for 1% its length. 
Inner bark gray or reddish, scales of the cup 
closely appressed. 
Cup brown, scales at maturity glabrous, 
glossy, acute, kernel white............... 12. Q. coccinea. 
Cup ashy, scales not glossy, hairy, blunt; 
kernele-yellowies cn. cee sae te oe ere te 13. Q. ellipsoidalis. 
Inner bark orange, scales at the top of the cup 
LOOSE eee ere resists oe le cas BREE crs. be 14 Q. velutina. 
Mature leaves with a gray or rusty pubescence be- 
neath, generally irregularly lobed................ 15. Q. falcata. 
**T eaves entire or with few teeth, or 3-5 lobed above 
the middle. 
Leaves entire, oblong, pointed at both ends........ 16 Q. imbricaria. 
Leaves obovate, 3-5 lobed above the middle, lobes 
TOUNCECEC Aceh eee ne hee eS. eae ae ent 17 Q. marylandica. 
1. Qvercus alba Linneus. WuiteEOax. Plate 43. Bark usually 
light gray, sometimes a very dark gray, not deeply fissured, flaky, 
especially on the upper part of the trunk and larger branches, some- 
times the lower part of the trunk is more deeply fissured with the 
