1910.] NATURAL SCIENCES OF PHILADELPHIA. 551 



more restricted to the Conowingo Barrens. Not distinguished in 

 records. 



Delaware. — Fawkes Run; Preston Run; Mineral Hill; Barrens of 

 Middletown; Williamson; Lenni; Wawa. 



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

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



— Nottingham Barrens. 



11. Andropogon furcatus Muhl. 



Frequent in depressions of dry barrens and about edges of thicket. 

 Delaware. — Fawkes Run (S. S. Van Pelt) ; Williamson. 

 Chester. — Sugartown Barrens; Brinton's Quarry. 



— Nottingham Barrens. 



12. SORGHASTRUM NUTANS (L.) Nash. 



Common on dry open barrens. 



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

 Williamson. 



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

 Brinton's Quarry. 



13. Paspalum pubescens Muhl. 



Common on dry open barrens. 

 Delaware. — Preston Run ; Lenni. 



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

 Cedar Barrens; West Chester. 



14. Syxtherisma filiformis (L.) Nash. 



Common on dry open barrens, especially in partial shade. 

 Delaware. — Fawkes Run ; Wawa. 



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

 Cedar Barrens; Unionville. 



fl5. Panicum philadelphicum Bernh. 



Abundant on dry open barrens. 



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

 Williamson; Wawa. 



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

 West Chester; Brinton's Quarry; Unionville. 



$16. Panicum dichotomiflorum Michx. 



Frequent in moist to dry border-woodland. 

 Delaware. — Middletown Barrens. 

 Chester. — Cedar Barrens. 

 36 



