APETALOUS EXOGENOUS PLANTS. 503 



length smooth on both surfaces. Flat or dry pine-barrens. 

 Roots creeping. 



Q. viRENS, Ait. {Live Oak.) Bra7iclilets tomentose; 

 leaves coriaceous, perennial, oblong, obtuse, somewhat ru- 

 gose, smooth and shining above, hoary-tomentose beneath, 

 the margins revolute ; fruit loug-peduncled ; cup top- 

 shaped, hoary, inclosing the base of the oblong chestnut- 

 brown nut. Dry or wet soil. — Commonly a large tree, with 

 spreading branches; leaves 2'-4' long. 



** Leaves Globed at the summit, bristle-aumed. 



Q. AQUATICA, Catesb. ( Water Oak.) Leaves perennial, 

 short-petioled, obovate-oblong or wedge-shaped, smooth on 

 both sides, obtusely 3-lobed at the summit, often entire, or 

 on young shoots pinnatifid-toothed or lobed, mostly awnless 

 when old ; fruit small, mostly sessile ; cup shallow, flat, 

 inclosing the base of the hemispherical downy nut. 

 Swamps and wet banks. — A small tree, with smooth bark ; 

 leaves 2 '-3' long, with tufts of down in the axils of the 

 veins when young. 



Var., HYBRIDA. Smooth, with ash-colored iranchlets ; 

 leaves oblong or wedge-oblong, entire, emarginate, or 

 3-lobed at the summit, tapering or abruptly contracted 

 into a short petiole; fruit very small, closely sessile; cup 

 shallow, flattened, inclosing the base of the ovate nut. — A 

 lofty tree; leaves 3'-4' long ; fruit 4"-5" long. 



Q. NIGRA, L. (Black Jack) Leaves short-petioled, 

 coriaceous, broadly wedge-shaped, rounded at the base, 

 mostly 3-lobed at the summit, bristle-awned, smooth above, 

 rusty-pubescent beneath, deciduous; fi-tcit middle-sized, 

 on short and thick peduncles; c?(^ top-shaped, with coarse 

 truncate scales, inclosing one-third or one-half of the ob- 

 long-ovate nnt. (Q. ferruginea, Michx.) Dry gravelly or 

 sandy soil. — A small tree ; leaves 4-9' long. 



*** Leaves long-petioled, sinuate-pinnatifid, bristle-awned, deciduotu. 

 t Leaves smooth or nearly so. 



Q. Catesb^i, Michx. {Turkey Oak.) Leaves some- 



