1910.] NATURAL SCIENCES OF PHILADELPHIA. 555 



*40. Deschampsia oespitosa (L.) Beauv. 



Frequent in moist sandy soil. 



Delaware. — Fawkes Run; Crum Creek (J. W. Harshberger) ; Wil- 

 liamson. 



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



{41. Danthonia spicata (L.) Beauv. 

 Frequent on dry open border-land. 

 Delaware. — Wawa. 

 Chester. — Unionville. 



*42. Atheropogon curtipendulus (Michx.) Fourn. 



Local, occasionally abundant, on dry open barrens. 

 Chester. — West Chester; Brinton's Quarry; Marshallton (B. Long); 

 Unionville. 



{43. Tridens flavus (L.) Hitchc. 



Frequent on dry open border-land. 

 Delaware. — Mineral Hill; Williamson; Lenni. 

 Chester. — Cedar Barrens; Unionville. 



44. Eragrostis pectinacea (Michx.) Steud. 



Common on dry open barrens. 



Delaware. — Preston Run; Bear Hill; Mineral Hill; Middletown 

 Barrens; Williamson; Lenni. 



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

 Brinton's Quarry; Unionville. 



— Nottingham Barrens. 



*45. Sphenopholis obtusata pubescens (Scribn. and Merr.) Scribn. 



Collected but once, over 40 years ago. 



Delaware. — "Newtown" (Dr. Geo. Smith), probably Fawkes Run. 



f46. Cyperus aristatus Rottb. 



Occasional on damp depressions or banks. 



Chester. — Serpentine Ridge (S. S. Van Pelt); Cedar Barrens (S. S. 

 Van Pelt); West Chester (J. W. Harshberger). 



47. Cyperus strigosus L. 



Frequent in moist depressions, quarry-holes. 



Chester. — Serpentine Ridge; Cedar Barrens; West Chester; Brin- 

 ton's Quarry; Unionville. 



