554 PROCEEDINGS OF THE ACADEMY OF [Oct., 



f32. Aristida gracilis Ell. 



Common on dry open barrens. 



Delaware.— Fawkes Run; Preston Run; Middletown Barrens! 

 Williamson ; Wawa. 



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

 Unionville. 



^33. Aristida purpurascens Poir. 



Frequent on dry open barrens. 



Dela ware.— Preston Run; Mineral Hill; Middletown Barrens; 

 Williamson; Lenni; Wawa. 



Chester,— Cedar Barrens; West Chester; Unionville. 



34. MUHLEXBERGIA SYLVATICA ToiT. 



Frequent in dry woodland and edges of greenbrier. 

 Delaware. — Fawkes Run ; Williamson. 

 Chester. — Unionville. 



f35. MUHLEXBERGIA FOLIOSA Trill. 



Frequent or local on border of greenbrier thicket and in partial shade. 

 Delaware. — Middletown Barrens; Williamson. 



36. Sporobolus vagix.eflorus (Torr.) Wood. 



Common on dry open barrens. 



Delaware. — Preston Run; Middletown Barrens; Williamson; Lenni; 

 Wawa. 



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

 Sconnelltown ; Unionville. 



*37. Sporobolus heterolepis A. Gray. 



Dry open barren, on State-line Barrens only. Reported also 

 from southern Lancaster Coimty, Pleasant Grove (J. J. Carter) and 

 New Texas (T. C. Porter), probably on contiguous Serpentine Barrens. 



Chester. — Nottingham Barrens. 



38. Agrostis perexxans (Walt.) Tuckerm. 



Common in moist to desiccated woodland. 



Delaware. — Fawkes Run; Middletown Barrens; Williamson; Wawa. 



Chester. — Sugartown Barrens ; Unionville. 



39. Agrostis hyemalis (Walt.) B. S. P. 



Occasional on diy barren. 

 Chester. — Cedar Barrens. 



