68 



(2. Carya.) 



amara, Nvtt. (Bitter Nut.) 



Wet woods along streams. Frequent. May. 



Order 87.— CUPULIFER.E. 107. 



1. Quercus, L. (Oak.) 



obtusiloba, Michx. (Post Oak.) 



Dry rocky hills. Frequent. All the species flower 

 in May. 

 alba, 1 L. (White Oak.) 



Woods. Common, 

 prinus, L. (Swamp Chestnut-Oak.) 



Low grounds Frequent. Acorn long, 

 prinus, L., var. monticola, Michx. (Rock Chestnut- 

 Oak.) 



Rocky hills; Brandywine, &c. Common, 

 prinus, L., var. discolor, Michx. (Swamp White Oak.) 



Low grounds. Frequent, 

 castanea, Willd. (Yellow Chestnut-Oak.) 



Rich woods; Brandywine, &c. Not common, 

 prinoides, Willd. (Chinquapin Oak.) 



Dry banks; Lancaster turnpike, near S. Graves'. 

 Rare. 

 Phellos, L. (Willow Oak.) 



Low woods; throughout the county. Common, 

 heteropb^'lla, Michx. (Bartram Oak.) 



Low woods; Townsend Station. Rare. Detected 

 by Thos. Meehan, June 18, 1860. 

 nigra, L. (Black Jack.) 



Dry sandy places in the western and southern part 

 of the county. Rare elsewhere, 

 falcata, Michx. (Spanish Oak.) 



Dry woods; Mill Creek, &c. Frequent, 

 falcata, Michx., var. triloba, Gr. 



In similar situations. Frequent, 

 tinctoria, Bartram. (Quercitron. Black Oak. 



Dry woods. Common. 



1 The horizontal roots, with a portion of the trunk, are much used for 

 knees in shipbuilding. 



