1912.] NATURAL SCIENCES OF PHILADELPHIA. 523 



Insert: 

 f23A. Panicum villosissimum Nash. 



Occasional on dry barrens. 



Delaware. — Preston Run; Williamson (B. Long). 



Chester. — West Chester. 



J26. Panicum boscii Poir. 



This is P. boscii molle (Vasey) Hitchc. if the form can be dis- 

 tinguished. Add: 



Delaware. — Preston Run. 



f35. Muhlenbergia foliosa Trin. Add: 

 Chester. — Nottingham Barrens (E. B. Bartram.) 



|39. Agrostis antecedens Bicknell. 2 Read: 



Frequent on moist to desiccated soil. This June-flowering plant 

 appears quite distinct from the late-flowering A. hyemalis (Walt.) 

 B. S. P., with which it has been confused. Its characteristics 

 have been clearly pointed out by Mr. E. P. Bicknell, to whom I am 

 indebted for confirmation of this determination. 



Delaware. — Fawkes Run; Williamson. 



Chester. — Serpentine Ridge; Cedar Barrens. 



— ■ Nottingham Barrens. 



41. Danthonia spicata (L.) Beauv. Add: 



Delaware. — Bear Hill. 



Chester. — Paoli; Sugartown Barrens; Cedar Barrens; West Ches- 

 ter. 



— Nottingham Barrens. 



Insert : 

 |44a. Sphenopholis obtusata (Michx.) Scribn. 



Frequent on dry open barren. Normally more or less scabrous, 

 at least on the lower sheaths. 

 Delaware. — Bear Hill. 

 Chester. — Serpentine Ridge; Cedar Barrens. 



— Nottingham Barrens. 



f45. Sphenopholis, obtusata pubescens (Scribn. and Merr.) 

 Scribn. Read: 



2 Bull. Torr. Bot. Club, XXXV (1908), 473. 



