334 FLORA. 



5. Quercus ellipsoidalis E. J. Hill. HILL'S OAK. A tall tree, the lowest 

 branches drooping, the bark close, fissured, gray, the innermost layer yellowish. 

 Leaves oval to obovate-orbicular in outline, when mature 615 cm. long, deeply 

 5~7-lobed, the sinuses rounded, shining above, glabrous or nearly so beneath, the 

 base broadly cuneate to truncate ; petioles 2.5-5 cm - l n g \ styles spreading or re- 

 curved, flattish ; cup turbinate, short-peduncled, its bracts pubescent, appressed ; 

 acorn ellipsoid to subglobose, 1-2 cm. long, 1-1.5 cm - thick, 1-2 times as long as 

 the cup. 111., Mich, and Minn. 



6. Quercus borealis Michx. f. GRAY OAK. A large tree, the leaves 

 similar to those of Q. rubra^ the acorns similar to those of Q. cocdnea. Leaves 

 7-i3-lobed to the middle or somewhat beyond, rather lustrous and deep 

 green above, dull and paler and glabrous or nearly so beneath; cup turbinate, 

 peduncled, its bracts appressed ; acorn ovoid, 1-2 times as long as the cup, about 

 2.5 cm. long. Quebec to Ont., N. Y. and Penn. (Q. ambigua Michx. f., not 

 H. & B.) 



7. Quercus velutina Lam. BLACK OAK. QUERCITRON. (I. F. f. 1232.) 

 A large forest tree similar to Q. cocdnea ; outer bark very dark brown, rough in 

 ridges, the inner bright orange. Leaves sometimes lobed to beyond the middle, 

 firm, brown -pubescent or sometimes stellate-pubescent when young, when mature 

 glabrous and dark dull green above, pale green and usually pubescent on the veins 

 beneath, and with tufts of wool in the axils, the broad oblong or triangular-lan- 

 ceolate lobes and their teeth bristle-tipped ; . cup hemispheric or top-shaped, 

 commonly narrowed into a short stalk, its bracts mostly pubescent, the upper 

 somewhat squarrose ; acorn ovoid, 1-2.5 cm. high, more or less longer than the 

 cup. Me. to Ont, Minn., Fla., Neb. and Tex. May-June. 



8. Quercus digitata (Marsh.) Sudw. SPANISH OAK. (I. F. f. 1233.) Leaves 

 dark green and glabrous above, gray-tomentulose beneath, deeply pinnatifid into 

 37 linear or lanceolate lobes, often falcate, acuminate ; terminal lobe commonly 

 elongated ; styles slender ; cup saucer-shaped with a turbinate base, 10-14 mm - 

 broad, its bracts ovate, obtuse, appressed ; acorn subglobose or depressed, about 

 twice as high as the cup. In dry soil, L. I. (?), N. J. to Fla., Mo., Neb. and Tex. 

 May-June. Acorns ripe Sept. -Oct. 



9. Quercus pagodaefolia (Ell.) Ashe. A tree sometimes 32 m. high, the 

 branches spreading, the bark dark gray, rough. I^eaves oval to oblong in outline, 

 cuneate to truncate at the base, 2-3 dm. long, deeply 5-11 -lobed, persistently white - 

 tomentulose beneath, dark green above, the lobes narrowly triangular, spreading 

 or somewhat ascending, usually entire ; twigs tomentose ; petioles 3-6 cm. long; 

 cup sessile, shallow, its bracts appressed ; acorn globose, about I cm. in diameter, 

 about one-half enclosed in the cup. In wet or moist soil, E. Va. and N. Car. to 

 Ga., Ind. and Mo. April-May. 



10. Quercus nana (Marsh.) Sarg. BEAR OR SHRUB OAK. (I. F. f. 1234.) 

 A shrub or rarely a small tree, often forming dense thickets ; bark gray, nearly 

 smooth. Leaves mostly obovate, 5-13 cm. long, short-petioled, dark green and 

 glabrous above, grayish-white tomentulose beneath, 3 7-lobed ; lobes triangular- 

 ovate, acute; styles recurved; cup saucer-shaped, 8-12 mm. broad, with a turbinate 

 or rounded base, its bracts lanceolate, appressed ; acorn globose-ovoid, longer than 

 the cup. In sandy or rocky soil, Me. to Ohio, Del., and the mountains of N. C. and 

 Ky. May. Acorns ripe Oct. -Nov. A hybrid of this, presumably with Q. cocd- 

 nea, was found by Dr. Robbins of Uxbridge, Mass. 



11. Quercus Marylandica Muench. BLACK-JACK OR BARREN-OAK. (I. F. 

 f. 1235.) Bark nearly black, very rough in ridges. Leaves obovate, stellate- 

 pubescent above and brown -tomentose beneath when young, 3-5 -lobed toward the 

 broad usually nearly truncate apex, cuneate below, the lobes short ; mature leaves 

 dark green, glabrous above, paler and more or less floccose beneath, 0.7-1.7 dm. 

 long, styles recurved ; cup deep, 10-16 mm. broad, its bracts oblong-lanceolate, 

 appressed, pubescent ; acorn ovoid, 2-3 times as high as the cup. In dry soil, 

 L. I. to Ohio, Neb., Fla. and Tex. Acorns ripe Oct. -Nov. 



Quercus Rudkini Britton, a hybrid of this with Q. Phellos, occurs from Staten I. to 

 N. Car. 



Quercus Brfttoni W. T. Davis is a hybrid with Q. nana. Staten I. 



