1910.] NATURAL SCIENCES OF PHILADELPHIA. 583 



70. Sambucus canadensis L. 

 Chester. — Unionville. 



1. Viburnum prunifolium L. 

 Delaware. — Williamson. 



72. Lactuca spicata (Lam.) Hitchc. 

 Delaware.— Williamson; Lenni. 



73. Nabalus albus (L.) Hook. 

 Delaware. — Williamson. 

 Chester. — Sugartown Barrens. 



74. Aster cordifolius L. 

 Delaware. — Williamson. 



75. Aster puniceus L. 

 Delaware. — Fawkes Run. 

 Chester. — Unionville. 



76. Erechtites hieracifolia (L.) Raf. 

 Delaware. — Williamson . 



77. Cirsium pumilum (Nutt.) Spreng. 

 Delaware. — Middletown Barrens. 



III. Some Prominent Introduced Species. 



1. Syntherisma linearis (Kroek.) Nash. 

 Occasional on dry open barren. 

 Delaware. — Mineral Hill. 



Chester. — Marshallton (B. Long). 



2. Anthoxanthum odoratum L. 

 Common on dry open barren. 

 Chester. — Serpentine Ridge. 



3. Eragrostis pilosa (L.) Beauv. 

 Occasional on banks, etc. 

 Delaware . — Lenni . 



4. Poa pratensis L. 

 Common on dry open barren. 



Chester. — Cedar Barrens ; West Chester : Unionville. 

 3S 



