Spring Flora of Oklahoma 
27 
7. Quercus Marilandica Muench. Black Jack Oak. A tree 
sometimes 60° high, usually lower. Leaves obovate in outline, stell¬ 
ate-pubescent above and brown-tomentose beneath when young, 3-5 
lobed toward the broad, usually nearly truncate, apex, cuneate be¬ 
low, the lobes short, entire or sparingly toothed, bristle-tipped. Ma¬ 
ture leaves dark green, glabrous above, paler and more or less floc- 
cose beneath. Cup deep, 5"-8" broad, its bracts oblong-lanceolate, 
appressed, pubescent. Acorn ovoid, 2-3 times as high as the cup. 
In dry soil. May-June. 
8. Quercus nigra L. Water or Black Jack Oak. A small tree. 
Leaves spatulate or obovate, 1-3-lobed at the apex, or some of them 
entire and rounded, coriaceous, short-petioled, finely reticulate-veined, 
glabrous when mature except tufts of hairs in the axil of the veins 
beneath, the lobes low, usually obtuse, and bristle-tipped. Cup saucer- 
shaped with a rounded base, 5"-7" broad, it's bracts appressed. Acorn 
globose-ovoid, 2-3 times as high as the cup. 
Along streams and on upland. April-Mjay. 
9. Quercus Phellos L. Willow Oak. A tree of medium size, 
leaves lanceolate or elliptical, scurfy when young and becoming 
smooth with age, very short-petioled. Cup shallow, nearly flat at 
the base, sessile. Acorn sub-globose. 
In moist woods. April-May. 
10. Quercus imbricaria Michx. Shingle Oak. Leaves oblong or 
lanceolate, entire, coriaceous, acute at both ends, short-petioled, 
bristle-tipped, dark green above, persistently brown-tomentulose be¬ 
neath. Cup hemispheric or turbinate, 5"-7" broad, its bracts ap¬ 
pressed. Acorn sub-globose. 
Rich woods. April-May. 
11. Quercus alba L. White Oak. Leaves obovate in outline. 
Green above, pale and more or less glaucous beneath, thin, pinnatifid 
into 3-9 oblong, obtuse, ascending, toothed or entire lobes. Cup de¬ 
pressed-hemispheric, 7"-10" broad, its bracts thick, obtuse, woolly 
or at length glabrate, closely appressed. Acorn ovoid-oblong, 3-4 
times as high as the cup. 
In woods. May-June. 
12. Quercus stellata Wang. Post Oak. Leaves broadly obovate 
in outline, deeply lyrate-pinnatifid into 3-7 broad, rounded, often 
deeply undulate or toothed, lobes; when mature firm, glabrous, dark 
green and shining above, brown tomentulose beneath. Cup hemis¬ 
pheric, G"-8" broad, base narrowed, its bracts lanceolate, sub-acute, 
slightly squarrose. Acorn ovoid, 2-3 times as long as the cup. 
In dry soil. May-June. 
13. Quercus lyrata Walt. Overcup Post Oak. Leaves obovate 
in outline, mostly narrowed at the base, lyrate-pinnatifid or lobed 
to beyond the middle, thin, densely white-tomentulose or becoming 
glabrate beneath, the lobes lanceolate or oblong, rounded or sub-acute, 
entire or toothed, the upper pair the larger and usually divergent. 
