46 FAM. 52, 



sides, - ______«_»_.d 



d. A small tree with thick, furrowed, blue-gray bark; leaves broad, 

 usually deeply pinnately lobed, and narrowed into a short pet- 

 iole; acorns short-peduncled, cup saucer- shaped or more or 

 less turbinate. On sandy ridges, Q. Catesbaei, Turkey Oak 



d. A tall tree with an irregularly ridged bark; leaves oblong to obo- 

 vate, 5-7 lobed, usually toothed, and lobes and teeth bristle-tipped; 

 acorns sessile or short-peduncled, cup turbinate, cultivated. 



Q. coccinea, Scarlet Oak 



e. Cup of acorn shallowly saucer-shaped; leaves glabrous, thick; — 



a tree with fairly smooth bark; leaves oblanceolate or spatu- 

 late, entire or 3-lobed at the apex, those of the shoots often pin- 

 natifid, glabrous on both sides or slightly tomentose beneath, 

 almost evergreen, the principal veins ending in bristles; acorns 

 sessile or short-peduncled, nut subglobose, pubescent. In not 

 too dry, sandy soil. - Q. nigra, L. (Q. aquatica, Walt.) Water-Oak 



e. Cup of acorn hemispherical; leaves brown-tomentose beneath; — 

 a tree with rough, black bark; leaf-blades obovate, 3-5 lobed 

 at the apex or with one much-dilated endlobe; acorns sessile 

 or short-peduncled, nut subglobose or ovoid. Dry gravelly or 



sandy soil. - - Q. Marylandica (Q. nigra, Wang), Black Jack 



f. Leaves glabrous on both sides, --------g 



f. Leaves gray-tomentose beneath; — a tree with gray and scaly 



bark; leaves oblong to oblanceolate; acorns nearly sessile, cup 

 saucer-shaped, nut oblong or subglobose. Dry pine-barrens. 



Q. brevifolia (cinerea), Blue Jack 



g. Tree almost evergreen, with nearly smooth bark; leaves linear- 



oblong to narrowly elliptic, acute and bristle-tipped at the apex, 

 usually entire except on young shoots; acorns sessile or nearly 

 so, cup saucer-shaped, nut subglobose. In moist sandy soil; 

 planted as a street-tree together with Q. aquatica under the name 

 of "Water Oak." - Q. Phellos, Willow Oak 



g. Tree with an almost black bark; leaves oblong, entire, or lobed on 

 shoots, or pinnatifid, bristle-tipped; acorns nearly sessile, cup 

 saucer-shaped with a constricted base, nut ovoid or subglobose. 

 Moist sandy soil near the coast. Q. laurifolia, Laurel-Oak 



h. Leaves deciduous; — shrub or small tree with obovate thickish 

 leaves, undulate or shallowly 3-lobed near the apex, lustrous 

 above and sparingly pubescent beneath, nearly sessile; acorns 

 sessile or nearly so, cup hemispherical, nut about twice as long 

 as the cup. In sandy barrens. 



Q. Chapmanii (Q. obtusifolia var. parvifolia) 

 h. Evergreens, ---------- -i 



i. Shrub with gray bark; leaves oblong, strongly revolute, rugose- 

 reticulated, glabrous above and finely pubescent beneath; cup 

 turbinate, tomentose, fringed at the edge; nut twice longer than 

 the cup. Sandy soil. - - - - Q. geminata, Shrub Live Oak 



i. Stout tree with grayish, furrowed bark; leaves obovate, oblong 

 or oval, entire except on the shoots, somewhat revolute, glab- 



