Phragmites GRAMINEAE Elymus 



Plain as far south as Sussex and Dorchester Counties: bank of 

 Choptank River at Cambridge (Do), R. R. Tatnall, 4587, 2 Aug. 

 1940 (T). Aug. to Oct. 



Triodia R. Br. 



T. flava (L.) Smyth. (Tridens flavus Hitchc.) Purpletop. 



Common; fields and roadsides. Piedmont and Coastal Plain. 

 Aug. to Oct. 



Triplasis Beauv. 



^^T. purpurea (Walt.) Chapm. Sand Grass. 



Frequent on maritime sands of the Coastal Plain; one inland 

 station: in a sandpit near bridge over Choptank River, 1 mi. s. of 

 Choptank Mills (K), R. R. Tatnall, 5047, 15 Sept. 1942 (T, A). 

 Aug. to Oct. 



HORDEAE 



Agropyron Gaertner 



A. cristatum (L.) Beauv. Crested Wheat Grass. 



Accidentally introduced with grass seed at University of Dela- 

 ware Experimental farm near Coochs Bridge (NC), 0. A. Pope, 14 

 June 1928 (UD). 



A. repens (L.) Beauv. Quack Grass. 



Common weed of roadsides and waste places. Nat. from 

 Europe. June to Sept. 



Elymus L. Wild Rye. 



E. villosus Muhl. {E. striatus of Gray's Man., ed. 7.) 



Infrequent, in rocky woods and alluvial meadows of the Pied- 

 mont and Coastal Plain. Late June, July. 



[E. canadensis L. Canada Wild Rye. 



Banks of streams, as reported by Commons and by E. Tatnall. 

 No specimens have been seen. Probably to be referred to E. 

 riparius Wieg.] 



E. riparius Wiegand. 



Frequent, on banks of streams. July to Oct. 



yjE. virginicus L. 



Infrequent, on borders of ponds and along streams. June to 

 August. 



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