APETALOUS EXOGENOUS PLANTS. 505 



cled ; cup smooth and shining, sancer-shaped, inclosing 

 one-third of the oval-globose nut. — Shrub, 6°-8° high, 

 growing in clusters; leaves 3-4' long; fruit abundant; 

 nut J-' long. 



+t Leaves tomentose beneath. 



Q. FALCATA, Michx. (82oanish Oak.) Leaves oblong, 

 rounded at the base, 3-5-lobed; the ZoJes entire or spar- 

 ingly toothed at the apex, the terminal one commonly nar- 

 now and elongated ; fruii; rather small ; cup somewhat top- 

 shaped, with coarse scales, inclosing half of the globular 

 nut. — Var. pagod^folia. Ell., has larger leaves, with 

 11-13 nearly opposite and spreading lobes. Dry woods. — 

 A large tree; leaves 4-5' long, entire near the base; nut 

 ¥ long. 



§ Frvit annual ; leaves awnless, deciduous. > 



* Leaves sinuate-lobed. 



Q. OBTUSILOBA, Michx. (Post Oalc.) Leaves with 5-7 

 broad rounded or notched lobes separated by wide open 

 sinuses, narrowed at the base into a short petiole, pubes- 

 cent beneath ; cup hemispherical, inclosing one-third or 

 one-half of the oval nut. Cold clayey soil. — A tree, 40°-50° 

 high; nut ^ long; leaves 4-6' long. 



Var., PARVIFOLIA. Leaves smaller (lJ'-3' long), oblong, 

 obtuse, entire or sinuate-toothed, nearly smooth on both 

 sides, rusty-pubescent, like the branchlets, when young; 

 nut larger. Sand-ridges near the coast. — A sliruh or small 

 tree. 



Q. ALBA, L. ( White Oah.) Leaves oblong or obovate- 

 oblong, with 7-9 mostly obtuse and entire narrow lobes 

 separated by narrow sinuses, narrowed into a petiole, 

 densely tomentose, like the branchlets, when young, at 

 length smooth or glaucous beneath; fruit large, nearly 

 sessile; c?^jt? hemispherical, inclosing one-third of the ob- 

 long-ovate nut. Damp woods. — A large tree, with white 

 bark; leaves 4'-6' long; nut about 1' long. 



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