56 FLORA OF PHILADELPHIA. 



New Castle— Low ground, east of Thompson 's Swamp, Commons. 

 2. Agropyron repens (L.) Beauv. Couch-grass, Quitch-grass. M. p. 153. 

 Fields and waste places. Summer. 



65. HORDEUM L. 



Flowering scales, exclusive of awn, 6-8 mm. long. 



Awn of the flowering scale 1.25 cm. long or less. 1. H. nodosum. 



Awn of the flowering scale 2.5 cm. long or more. 2. H. jubatum. 



Flowering scales, exclusive of awn, about 1.2 cm. long. 3. H. murinum. 



1. Hordeum nodosum L. Meadow-Barley. M, p. 155. Meadows and waste 



places. Summer. 

 Bucks— Perkasie, in ditches (Fr;). 

 Cape May— Goshen Landing (He.). 



2. Hordeum jubatum L. Squirrel-tail Grass. M. p. 155. Dry soil. Sum- 



mer. 



Philadelphia— Commons, Mart. (B. C). Bucks— Quakertown, Telford 

 (Fr.). Montgomery— Ambler (Fr.). Delaware— Tinicum, rare (VP.). 

 Chester— Valley Forge (W. Tr,). Lancaster— West Grove (Ca.). 



Camden— Kaighn's Point (Ja.). Atlantic— Hammonton (C), Atlantic 

 City (He.). Mercer— Trenton (C). 



New Castle— Shores, "Woodland Beach, Commons. 



3. Hordeum murinum L. Wall-Barley. M. p. 155. Ballast and waste 



places. Summer. 

 Philadelphia— Fairmount Park (Ja.). 

 Camden— Kaighn 's Point (He.). 



66. ELYMUS L. Lyme-grass, Wild Eye. 



Empty scales narrowly awl-shaped; spike slender. 1. E. striatus. 



Empty scales linear-lanceolate to linear; spike stout. 



Flowering scales glabrous. 2. E. Virginicus. 



Flowering scales more or less appressed-pubescent, usually densely so. 



3. E. Canadensis. 



1. Elymus striatus Willd. M. p. 156. Bocky woods and banks. Summer. 



Philadelphia— Wissahickon (VP.). Delaware — Marple, Dr. Geo. Smith 

 (Fu.), Valley of Darby Creek (B. Sm.), Concord (W. Tr.). Chester— 

 (P.). Lancaster— (P.). Northampton— Easton, Porter (B. C). 



Cape May — Wildwood (He.). Hunterdon — Bosemont, Bidge Island 

 (C). 



New Castle— Mount Cuba, Greenbank, Brandywine, Commons. 



2. Elymus Virginicus L. M. p. 156. Along streams. Summer. 



3. Elymus Canadensis L. M. p. 157. River banks. Summer, 



67. HYSTRIX (L.) Millsp. 



1. Hystrix Hystrix (L.) Millsp. Bottle-brush Grass. M. p. 158. Rocky 



woods. Summer. 



Philadelphia— Schuylkill, near junction of Wissahickon (He.). Bucks 



— Sellersville (Fr.). Montgomery— Above Lafayette (VP.), Skippach 



Creek, Sumneytown (VP.). Delawa/e— Wawa (Ke.), Lansdowne (Pe.), 



