190 FAGACEAE 
Leaves about 5 lobed, sometimes less, often more. Lobes sharp, sinuses 
angular, but variable; when mature, dark green above, with silvery silki- 
ness beneath. Bark dark brown, scaly. Maine and westward. 
7. Q. marylandica, Muench. (Fig. 3, pl. 29.) Brack Jack. Bar- 
REN OAK. Moderately tall or small tree. Leaves much broadest at the 
free extremity; lobes rounded shallow and generally 3, confined to the 
free extremity. Cup covering 1/3 the acorn. Branches irregular; bark 
almost black, scaly. Long Island and westward. 
8. Q. phellos, L. (Fig. 4, pl. 29.) Wittow Oak. One of two oaks 
native in our region whose leaves are neither lobed or serrated. A 
moderately high tree with long narrow leaves with smooth edges; the 
basal extremity acute and the free extremity generally so. Surface of 
leaves above deep shining green, below lighter. Acorns quite small. Long 
Island and southward. 
9. Q. imbricaria, Michx. (Fig. 12, pl. 29.) Sninere Oak. A tall 
tree with lance-shaped leaves with smooth margins and bristle points. 
The under surface of the leaves gray with silky hairs which are perma- 
ment. Central Penna., and southward. 
10. Q. alba, L. (Fig. 4, pl. 28.) Wuirr Oax. One of the largest 
of the oaks. Leaves deeply cut into narrow but rounded lobes without 
spines or bristles, the sinuses generally very deep; lobes about 6, dark 
green above, rather lighter below. Cup shallow covering about 1/5 the 
acorn. Bark light gray with shallow fissures. Throughout our area. 
11. Q. stellata, Wang. (Fig. 6, pl. 28.) Post on Iron Oak. (Q. 
minor, Sarg.). Sometimes a shrub, sometimes a moderately tall tree. 
Leaves deeply divided by rounded sinuses, the lobes, about 5, about as 
broad as, or even broader at the outer extremities, than at the inner; 
bristles absent. Dark shining green above, silky brown beneath. Cup 
covering about 3 the acorn. Mass., southern New York, westward and 
southward. 
12. Q.lyrata, Walt. (Fig. 5, pl. 29.) Swamp Oak. Overcup OAK. 
Post Oak. Tall tree. Leaves with about 5 lobes, the deep and broad 
sinuses near the center giving the leaf a peculiar construction there which 
is characteristic. Surface of leaves bright green above, densely silky and 
white below. Cup covering 2/3 of the nut which is broad and flat. New 
Jersey and southward. 
13. Q. macrocarpa, Michx. (Fig. 2, pl. 28.) Mossy Cup Oak. Bur 
Oak. Tall tree. Leaves with about 7 rounded lobes with generally shal- 
low sinuses, deep green above, silky gray beneath. Cup with coarse scales 
and with a distinct fringe at its border composed of the bristly tips of 
the upper layer. Bark gray, in flakes or scales. Throughout most of our . 
area. 
14. Q. bicolor, Willd. (Fig. 8, pl. 29.) Swamp Wuirre Oak. (Q. 
platanoides, Sudw.) Large tree. Leaves, in general form, ovate with free 
extremity broadest. Lobes rounded, about 7 in number, the sinuses gen- 
enerally quite shallow, the stem end decidedly tapering. Bright yellowish- 
green above, pale green to white, silky beneath. Bark gray, flaky. Acorn 
narrow, cup covering the lower half. Generally in our area. 
15. Q. Muhlenbergii, Englm. (Fig. 11, pl. 29.) CHESTNUT OR YEL- 
