564 PROCEEDINGS OF THE ACADEMY OF [Oct., 



Chester. — Sugartown Barrens (E. B. Bartram); Serpentine Ridge; 

 Cedar Barrens; West Chester; Sconnelltown ; Brinton's Quarry; 

 Union ville. 



— Nottingham Barrens. 



105. Saxifraga virginiensls Michx. 



Frequent on dry open barren, banks and edges of woodland. 

 Del. — Middletown Barrens; Williamson; Wawa. 



fl06. Spiraea latifolia Borkh. 

 Frequent in Serpentine swamps. 



Delaware. — Williamson (Dr. J. B. Brinton, Jos. Crawford). 

 Chester. — Cedar Barrens; West Chester; Unionville. 



— Nottingham Barrens. 



107. Rubus frondosus Bigel. (?) 

 Common, especially on edge of dry barren. 

 Delaware. — Bear Hill; Williamson. 

 Chester. — Unionville. 



— Nottingham Barrens. 



108. POTENTILLA PUMILA Poir. 



Common on dry open barren. 



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



Chester. — Sugar/town Barrens; Cedar Barrens; West Chester. 



fl09. Sanguisorba canadensis L. 

 Frequent in rich Serpentine swamps. 



Delaware. — Fawkes Run (B. H. Smith, S. S. Van Pelt) ; Williamson. 

 Chester. — Nottingham Barrens. 



110. Rosa humilis Marsh. 



Frequent on dry open barren and margin of greenbrier. 

 Delaware. — Fawkes Run; Bear Hill; Middletown Barrens; Wawa. 

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

 Brinton's Quarry; Unionville. 



— Nottingham Barrens. 



■**=•* 



111. Aronia nigra (Willd) Britton. 



Occasional on dry open barren. 

 Delaware. — Fawkes Run; Wawa. 



