1910.] NATURAL SCIENCES OF PHILADELPHIA. 561 



85. CORYLUS AMERICANA Walt. 



Common on drv barren, edges of woodland and thicket. 

 Delaware. — "Cram Creek" (J. W. Harshberger) ; Lenni. 

 Chester. — Sugartown Barrens ; West Chester. 



86. Alnus rugosa (Du Roi) Spreng. 



Frequent on dry edges of woodland or in Serpentine swamp. 

 Dela ware. — Middletown Barrens ; Williamson. 



J87. Castanea dentata (Marsh.) Borkh. 



Frequent in border-woodland. 

 Delaware. — Fawkes Run. 



88. Quercus palustris Du Roi. 



Local in moist woodland, borderland. 



Delaware. — Fawkes Run. 



Chester. — Sugartown Barrens; Cedar Barrens. 



f89. Quercus ilicifolia Wang. 



Frequent or local on dry open barren. 



Delaware. — Fawkes Run. 



Chester. — Cedar Barrens; West Chester. 



— Nottingham Barrens. 



*90. Quercus marylandica Mench. 



Locally abundant on dry barren. 



Delaware. — Middletown Barrens; Williamson; Lenni; Wawa; 

 "Crum Creek" (J. W. Harshberger). 



Chester. — Nottingham Barrens. 



91. Quercus alba L. 

 - Frequent in border-woodland. 



Delaware. — Fawkes Run. 



Chester. — Unionville. 



f92. Quercus stellata Wang. 



Abundant on dry barren. 



Delaware. — Fawkes Run; Blue Hill; Mineral Hill; Middletown 

 Barrens; Williamson. 



Chester. — Sugartown Barrens; Serpentine Ridge; Cedar Barrens; 

 West Chester; Unionville. 



— Nottingham Barrens. 



