33 6 FLORA. 



1 8. Quercus lyrata Walt. Swamp, Overcup or Post Oak. (I. F. f. 1242.) 



A large tree; bark gray or reddish, in thin plates. Leaves obovate, 1.5-2 dm. 

 long, lyrate-pinnatifid or lobed to beyond the middle, thin, when mature bright 

 green and .sinning above, densely white-tomentulose beneath, the lobes entire or 

 toothed, the upper pair the larger and usually divergent; fruit peduncled; styles 

 short, cup depressed-globose, 2.5-3.5 cm - m diameter, its bracts broad, thin, cus- 

 pid ite; acorn depressed- globose, nearly or quite immersed in the cup. In swamps 

 or along streams, N. J. to Ind., Mo., Fla. and Tex. April-May. 



19. Quercus macrocarpa Michx. Mossy-cup or Bur Oak. (I. F. f. 1243.) 

 A large tree, with gray flaky bark. Leaves obovate or oblong -obovate, rather 

 thin, irregularly lobed, pinnatifid, or some coarsely crenate; when mature bright 

 green and shining above, grayish-white-tomentulose beneath, 1-2 dm. long, the 

 lobes toothed or entire, rounded; fruit short-peduncled or sessile; styles short; cup 

 hemispheric or subglobose, 1.5-2.5 cm. in diameter, its bracts floccose, thick, hard, 

 ovate or lanceolate, the lower acute, the upper subulate-tipped, the tips forming a 

 fringe around the acorn; acorn 1.5-3.5 cm - l° n &> ovoid, 1-2 times as high as the 

 cup. In rich soil, N. S. to Manitoba, Mass., Penn., Kans. and Tex. May-June. 

 Hybridizes with Q. acuminata in Kans. and Mo. 



20. Quercus platanoides (Lam.) Sudw. Swamp White Oak. (I. F. f. 

 1244.) A large tree, with flaky gray bark. Leaves obovate, or oblong-obovate, 

 coarsely toothed or sometimes lobed nearly to the middle, firm, when mature 

 1-2 dm. long, dark green, dull and glabrous above, densely white-tomentulose 

 beneath; peduncles 2-5 times as long as the petioles; cup hemispheric, its bract' 

 pubescent, lanceolate, appressed, the lower obtuse, the upper acute or acuminate, 

 acorn oblong-ovoid, about 2.5 cm. high; cup about 1.2 cm. high; seed rather 

 sweet. In moist or swampy soil, Quebec to Mich., Ga. and Ark. May-June. 

 Acorns ripe Sept.-Oct. [Q. bicolor Willd.] 



21. Quercus Michauxii Nutt. Cow Oak. Basket Oak. (I. F. f. 1245.) 

 A large tree, with white flaky bark. Leaves obovate or broadly oblong, when ma- 

 ture bright green, feebly shining above, pale and gray-tomentulose beneath, cre- 

 nately toothed, 1-2 dm. long, the teeth often mucronulate; fruit short-peduncled or 

 sessile; styles very short; cup depressed-hemispheric, 2.5-3.5 cm. broad, its bracts 

 thick, ovate or lanceolate, appressed; acorns ovoid, about 3 times as high as the 

 cup. In moist soil, Del. to Ind., Mo., Ark., Fla. and Tex. April-May. Acorns 

 ripe Sept. -Oct., sweet and edible. 



22. Quercus Prinus L. Rock Chestnut Oak. (I. F. f. 1246.) A large 

 tree; bark brown, ridged, close or slightly flaky. Leaves coarsely crenate, oblong, 

 oblong-lanceolate or obovate, when mature dark green, glabrous and feebly shining 

 above, finely gray-tomentulose beneath, 1.2-2 dm. long; petioles slender; peduncles 

 equalling or shorter than the petioles; styles very short; cup hemispheric, 1-3 cm. 

 broad, its bracts tomentose, triangular -ovate, acute or cuspidate, appressed; acorn 

 ovoid, 2-3 times as high as the cup; seed edible, but not very sweet. In dry soil, 

 Me. to Out.. Ala. and Tenn. May-June. Acorns ripe Oct.-Nov. 



23. Quercus acuminata (Michx.) Houda. Chestnut or Yellow Oak. 

 (I. F. f. 1247.) A tree with gray close bark. Leaves oblong, lanceolate or some- 

 times obovate, acuminate or acute, coarsely toothed, with acute teeth, when mature 

 dark green and shining above, pale, gray-tomentulose and prominently veined 

 beneath, 1-1.5 cm. long, 2.5-6 cm. wide; fruit sessile or very short peduncled; 

 cup hemispheric, 1-1.6 cm. broad, its bracts floccose, ovate, thick, acute or cuspi- 

 date, appressed; acorn ovoid, 1-2 cm. high, about twice as high as the cup. In 

 dry soil, preferring limestone ridges, Ont. to Minn., Ga., Ala. and Tex. May-June. 

 Acorns ripe Oct.-Nov., edible. [Q. Muhlenbergii Engelm.] 



24. Quercus Alexanderi Britton. Alexander's Oak. (I. F. f. 

 1245; leaves.) A tree similar to the preceding species, but the leaves broadest 

 above the middle, obovate or oblong-obovate; cup cupulate, short-stalked or sessile, 

 shallow; acorn ovoid, 1.5-2 cm. long, 2-3 times as high as the cup; bark, es- 

 pecially that of old trees, flaky. Vt. to Mich., Ohio and Ind. Type specimens 

 from Birmingham, Mich. 



25. Quercus prinoides Willd. Scrup. Chestnut Oak. (I. F. f. 1248.) A 

 shrub, 0.6-5 m. tall, sometimes tree-like, the bark gray. Leaves obovate, coarsely 

 toothed, when mature bright green and somewhat shining above, gray-tomentulose 



