FAGACEAE 107 



b. Leaf-blades entire, rarely lobed or toothed on vigorous shoots. 

 Lower surface of the leaf-blades glabrous. 9. 0. Phellos. 



Lower surface of the leaf-blades pubescent. 10. O. ivibricaria. 



B. Leaf-blades or their lobes or teeth without bristles ( except on shoots) : 

 nuts often glabrous within. 

 Leaf-blades prominently and deeply lobed. 

 Mature leaf-blades glabrous and pale, or glaucous beneath : cups shallow. 



II. Q. alba. 

 Mature leaf-blades pubescent beneath : cup fully % as long as the nut. 

 Upper scales of the cup not awned. 

 Upper scales of the cup awned. 

 Leaf-blades coarsely toothed. 

 Acorns peduncled. 

 Peduncles much longer than the petioles. 

 Peduncles mostly shorter than the petioles. 

 Acorns sessile. 

 Tall tree : leaf-blades mostly broadest below the middle. 



16. Q. acuminata. 

 Diffuse shrub or small tree : leaf-blades broadest above the middle. 



J 7- Q- pfinoides. 



1. Qviercua rubra L. Red Oak. (Man. p. 333; I. F./. 1228.) N. 

 S. to Minn., Fla., Kans., and Tex. — Peiinsylvauia : Northampton; 

 Bucks ; Monroe ; Lancaster ; Huntingdon ; Chester ; Lacka- 

 wanna ; Tioga ; Franki^in ; Delaware ; Allegheny. 



2. Quercus palustris Du Roi. Swamp or Pin Oak. (Man. p. 333 ; 

 I. F. /. 1229.) lu moist ground, Mass. to Wis., Del. and Ark. — Penn- 

 sylvania : Chester ; Huntingdon ; Franklin ; Lancaster ; York ; 

 Delaware ; ALLEGHENY. 



3. Quercus coccinea Wang. Scarlet Oak. (Man. p. 333 ; I. F.y. 

 1231.) In dry soil, Me. to Minn., Fla. and Mo. — Pennsylvania : Ches- 

 ter ; Monroe ; Huntingdon ; Lancaster ; Northampton ; Lacka- 

 wanna ; Franklin; Delaware; Allegheny. 



4. Quercus velutina Lam. Black Oak. Quercitron. (Man. p. 

 334 ; I. F.y! 1232.) Me. to Minn., Fla. and Tex. — Pennsylvania : Hunt- 

 ingdon ; Frankxin ; Lancaster ; Chester ; Monroe ; Delaware ; 

 Allegheny. 



5. Quercus digltata (Marsh.) Sudw. Spanish Oak. (Man. p. 334; 

 \. F./. 1233.) In dry soil, N. Y., N. J. to Fla., Mo. and Te-^.—Pennsyl 

 vania : Chester; Delaware; Philadelpi-^ ; Franklin. 



6. Quercus nana (Marsh. ) Sargent. Be.\R OR Scrub Oak. (Man. p. 

 334; I. ¥. /. 1234.) In sandy or rocky soil, Me. to O., N. C. and the 

 mountains of Va. and Ky. — Pennsylvania : Monroe ; Northampton ; 

 Pike ; Lancaster ; Huntingdon ; Chester ; Franklin ; Delawark ; 

 Allegheny. 



7. Quercus nigra L. Water Oak. (Man. p. 335; I. F. /. 1236.) 

 Along streams and swamps, Del. to Ky., Mo., Fla. and Tex. Adv. north- 

 ward. — Pettnsylvania : Locally introduced in the southeastern part of the 

 State. 



