FAGACEAE 107 



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

 Lower surface of the leaf-blades glabrous. g, Q. Phellos. 



Lower surface of the leaf-blades pubescent. lo. Q. imbricaria. 



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 Vi as long as the nut. 

 Upper scales of the cup not awned. 12. Q. minor. 



Upper scales of the cup awned. 13. Q. macrocarpa. 



Leaf-blades coarsely toothed. 

 Acorns peduncled. 

 Peduncles much longer than the petioles. 14. Q. plaianoides. 



Peduncles mostly shorter than the petioles. 15. Q. Prinus. 



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. 



17. Q. prinoides. 



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

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

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

 wanna ; Tioga ; Frankwn ; Delaware ; Allegheny. 



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

 I. F. /. I22g.) In moist ground, Mass. to Wis., Del. and Ark. — Penn- 

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

 Delaware ; Allegheny. 



3. Quercus coocinea 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 velutlna Lam. Black Oak. Quercitron. (Man. p. 

 334 ; I. F./. 1232.) Me. to Minn., Fla. and Ten.— Pennsylvania : Hunt- 

 ingdon ; Franklin ; Lancaster ; Chester ; Monroe ; Delaware ; 

 Allegheny. 



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

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

 vania : Chester ; Delaware ; Philadelpia ; Franklin. 



6. Quercus nana (Marsh.) Sargent. Bear OR Scrub Oak. (Man. p. 

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

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

 Pike ; Lancaster ; Huntingdon ; Chester ; Franklin ; Delaware ; 

 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. — Pennsylvania : Locally introduced in the southeastern part of the 

 State. 



