570 PROCEEDINGS OF THE ACADEMY OF [Oct., 



154. Azalea nudiflora L. 



Frequent on edges of thicket. 



Delaware. — Mineral Hill; Williamson; Wawa. 



Chester. — West Chester. 



155. Pieris mariana (L.) Benth. and Hook. 

 On dry open barren. 



Chester. — Nottingham Barrens. 



156. Xolisma ligustrina (L.) Britton. 

 Frequent on dry barrens. 

 Delaware. — Middletown Barrens. 

 Chester. — Cedar Barrens. 



— Nottingham Barrens. 



157. Gaylussacia baccata (Wang.) C. Koch. 

 Common on dry open barren. 



Delaware. — Fawkes Run; Mineral Hill; Williamson; Wawa. 

 Chester. — Sugartown Barrens; Cedar Barrens; West Chester; 

 Unionville. 



— Nottingham Barrens. 



158. Polycodium stamineum (L.) Greene. 



Frequent on dry barrens, eds;es of woodland or thicket. 

 Delaware. — Mineral Hill; Middletown Barrens; Williamson; Wawa. 

 Chester. — Sugartown Barrens; Cedar Barrens; West Chester; 

 Unionville. 



— Nottingham Barrens. 



*■&■* 



159. Vaccinium atrococcum (Gray) Heller. 

 Frequent on eds;es of thicket or depressions. 

 Delaware. — Williamson ; Wawa. 



Chester. — Sugartown Barrens; West Chester. 



160. Vaccinium pennsylvanicum Lam. 

 Occasional on dry open barren. 

 Delaware. — Fawkes Run. 



161. Vaccinium vacillans Kalm. 



Common on diy open barren, borders of woodland, and in woodland. 

 Delaware. — Fawkes Run; Mineral Hill; Williamson; Wawa. 

 Chester. — West Chester ; Unionville. 



