404 REPORT OF NEW JERSEY STATE MUSEUM. 



QUERCUS L. 



Flozvering and Fruiting Data. — Flowers in late spring when 

 leaves are usually one-third to one-half expanded. Fruit ripe and 

 dropping in early or mid-autumn of either the first or second 

 season. 



Key to the Species. 



a. Leaves or their lobes bristle-tipped. 



b. Leaves oblong or linear oblong, entire (or with 1-2 irregular points or 

 lobes). 



c. Linear-oblong, never lobed. Q. phellos, p. 408 



cc. Oblong occasionally with an irregular lobe or two. 



Q. rudkini, p. 411 

 bb. Leaves obovate, generally 3-5 lobed above the middle, rusty tomen- 

 tose or pubescent beneath. Q. marilandica, p. 407 



bhb. Leaves pinnately lobed. 

 c. Green beneath. 



d. Cup or acorn shallow, saucer-Hke. 



e. Cup 16-25 mm. broad, acorn ovoid. Q. rubra, p. 405 



ee. Cup 8-16 mm. broad,'acorn subglobose. Q. palustris, p. 405 

 dd. Cup turbinate, or hemispheric. 



e. Cup brown, the scales finally glabrate and shiny. 



Q. coccinea, p. 405 

 ee. Cup ashy, with persistent dull pubescence. 



Q. velutina, p. 405 

 cc. Grayish-white beneath. 



d. Large tree, leaf lobes, lanceolate, sometimes falcate. 



Q. triloba, p. 406 

 dd. Small tree or usually shrub, leaf lobes triangular. 



Q. ilicifolia, p. 407 

 aa. Leaves or their lobes not bristle-tipped, more or less rounded. 

 b. Leaves pinnately lobed. 



c. Pale or glaucous and glabrous beneath. Q. alba, p. 408 



cc. Brown tomentose beneath, lyrate-pinnatifid. O. stellata, p. 409 

 ccc. White tomentous beneath, lyrate-pinnatifid. Q. lyrata, p. 409 



bb. Leaves crenate or dentate, not lobed. 



c. Low shrub, leaves ovate or obovate, 6-13 X 5-8 cm. 



Q. prinoides, p. 410 

 cc. Tall tree, leaves much larger. 



d. Leaves white tomentulose beneath, peduncle of acorn much 

 larger than the petioles. Q. bicolor, p. 409 



dd. Leaves gray, tomentulose beneath, peduncles equalling or 

 shorter than the petioles. 

 e. Bark, white flaky, leaves broadly obovate, teeth sharper. 



Q. michauxii, p. 410 

 ee. Bark close, leaves narrower, teeth rounder. 



Q. prinus, p. 410 



