BEECH FAMILY. 521 
15. Quercus lyrata Walt. Swamp, Overcup or Post Oak. (Fig. 1242.) 
Quercus lyrata Walt. Fl. Car. 235. 1753. 
A large tree, maximum height about 1oo° and trunk 
diameter 344°; bark gray or reddish, in thin plates. 
Leaves obovate in outline, mostly narrowed at the 
base, 6’—S’ long, lyrate-pinnatifid or lobed to beyond 
the middle, thin, when mature bright green, glabrous 
and shining above, densely white-tomentulose be- 
neath, the lobes lanceolate or oblong, rounded or sub- 
acute, entire or toothed, the upper pair the larger and 
usually divergent; petioles 3’’-9’’ long; fruit matur- 
ing the first season, peduncled; styles short; cup de- 
pressed-globose, 1/-1'4’ in diameter, !4/-1’ high, its 
bracts broad, thin, cuspidate; acorn depressed-globose, 
44/-14“ high, nearly or quite immersed in the cup. 
In swamps oralong streams, New Jersey to Indianaand 
Missouri, Florida and Texas. Wood hard, strong, tough, 
close-grained, very durable, dark brown; weight per cubic 
foot 52 lbs. April-May. 
Mossy-cup or Bur Oak. (Fig. 1243.) 
Quercus macrocarpa Michx. Hist. Chen. Am. 2, 
pl. 23.  r8or. 
Quercus olivaeformis Michx. f. Hist. Arb. Am. 2: 
pl. 2. 1812. 
A large tree, with gray flaky bark; maximum 
height about 160°, and trunk diameter 8°. 
Leaves oboyate or oblong-obovate in outline, 
rather thin, irregularly lobed, pinnatifid, or 
some coarsely crenate; when mature bright 
green and shining above, grayish-white-tomen- 
tulose beneath, 4’—-8’ long, the lobes toothed or 
entire, rounded, ascending or somewhat diver- 
gent; petioles %4/-1’ long; fruit short-peduncled 
or sessile, maturing the first season; styles 
short; cup hemispheric or subglobose, 8/’—2/ in 
diameter, its bracts floccose, thick, hard, ovate 
or lanceolate, the lower acute, the upper subu- 
late-tipped, the tips forming a fringe around the 
acorn; acorn 8’/-114’ long, ovoid, 1-2 times as 
high as the cup. 
In rich soil, Nova Scotia to Manitoba, south to Massachusetts, Pennsylvania, Kansas and Texas. 
Wood hard, strong, tough, close-grained; color dark brown; weight 46 lbs. May-June. 
17. Quercus platanoides (Lam.) Sudw. Swamp White Oak. (Fig. 1244.) 
O. Prinus platanoides Lam. Encycl. 1: 720. 1783. 
Quercus bicolor Willd. Neue Schrift. Ges. Nat. Fr. 
Berlin, 3: 396. _18or. 
QO. platanoides Sudw. Rep. Secy. Agric. 1892: 327. 1893. 
A large tree, with flaky gray bark; maximum 
height about 110° and trunk diameter 9°. Leaves 
obovate, or oblong-obovate, coarsely toothed or 
sometimes lobed nearly to the middle, narrowed or 
rounded at the base, firm, when mature 4’—7’ long, 
3%’-4%’ wide, dark green, dull and glabrous 
above, densely white-tomentulose beneath; peti- 
oles stout, 3/’-9’’ long; fruit maturing the first 
year; peduncles 2-5 times as long as the petioles; 
cup hemispheric, its bracts pubescent, lanceolate, 
appressed, the lower obtuse, the upper acute or 
acuminate; acorn oblong-ovoid, about 1’ high; cup 
about 6’’ high; seed rather sweet. 
In moist or swampy soil, Quebec to Michigan, 
Georgia and Arkansas. Wood hard, strong, tough, 
close-grained, light brown; weight 48 lbs. per cubic 
foot. May-June. Acorns ripe Sept.—Oct. 
