521 



(Fig. 12; 



BEECH FAMILY. 

 15. Quercus lyrata Walt. Swamp, Overcup or Post Oak. 



rcus lyrala Walt. Fl. Car. 235. 1753. 



A large tree, maximum height about 100 and trunk 

 diameter 3^; 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, i'-i#' in diameter, #'-i' high, its 

 aracts broad, thin, cuspidate; acorn depressed-globose, 



'-!%' high, nearly or quite immersed in the cup. 



In swamps or along streams, New Jersey to Indiana and 

 lissouri, Florida and Texas. Wood hard, strong, tough. 

 close-grained, very durable, dark brown; weight per cubic 

 foot 52 Ibs. April-May. 



16. Quercus macrocarpa Michx. Mossy-cup or Bur Oak. (Fig. 7243.) 



Quercus macrocarpa Michx. Hist Chen. Am. 2. 



pi. 2j. 1801. 

 Quercus olivaeformis Michx. f. Hist. Arb. Am. 2: 



pi. 2. 1812. 



A large tree, with gray flaky bark ; maximum 

 height about 160, and trunk diameter 8. 

 Leaves obovate or oblong-obovate in outline. 

 rather thin, irregularly lobed, pinnatifid, or 

 some coarsely crenate; when mature bright 

 green and shining above, grayish-wbite-tomen- 

 tulose beneath, 4 / -8 / long, the lobes toothed or 

 entire, rounded, ascending or somewhat diver- 

 gent; petioles %'- 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"-i}4' 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 IDS. May -June. 



17. Quercus platanoides (Lam.) Sudw. 



Q. Prinus platanoides Lam. Encycl. i: 720. 1783. 

 Quercus bicolor Willd. Neue Schrift. Ges. Nat. Fr. 



Berlin, 3: 396. 1801. 

 Q. platanotdesSudw. 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 i' 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 Ibs. per cubic 

 foot. May-June. Acorns ripe Sept. -Oct. 



Swamp White Oak. (Fig. 1244. > 



