44 FLORA OF PHILADELPHIA. 



Branches of the panicle capillary, elongated, usually dividing 

 above the middle, the spikelets crowded at the extrem- 

 ities. 

 Spikelets 1.5-2 mm. long; leaves short. 



4. A. hyemalis. 

 Spikelets 2.5-3 mm. long; leaves elongated. 



5. A. altissima. 

 Branches of the panicle not elongated, dividing at or below the 



middle. 6. A. Scribneriana. 



1. Agrostis alba L. Florin. Red-top, Herd-grass. M. p. 109. Meadows 



and fields. Summer. 



2. Agrostis canina L. Bent-grass. M. p. 110. Meadows. Summer. 



Philadelphia— Ballast, Mart. (B. C). Northampton— -Pot Rock, Eas- 

 ton, Porter (B. C). Dauphin— (P.). 



3. Agrostis perennans (Walt.) Tuekerm. Thin-grass. M. p. 110. Damp, 



shaded places. Summer. 



4. Agrostis hyemalis (Walt.) B. S. P. Hair-grass. M. p. 110. Dry or 



moist places. Summer. 



5. Agrostis altissima (Walt.) Tuekerm. Bent-grass. M. p. 111. Swamps. 



Late summer. 



Montgomery — (P.) . 



Burlington— Atsion (C). Camden— Atco (C). Atlantic — Atlantic 

 City, C. A. Boice (B. C), Egg Harbor, Landisville, Hammonton (C). 

 Ocean— Forked River (Li.). 



New Castle— McCrones (FarnhursJ;), Commons. 



6. Agrostis, Scribneriana Nash. M. p. 111. In dry soil. Autumn. 



Lancaster— (P.') . Northampton— (P.) . 



31. CALAMAGROSTIS Adans. 



Prolongation of the rachilla hairy its whole length. 1. C. Canadensis. 



Prolongation of the rachilla hairy only at the summit. 2. C. cinnoides. 



1. Calamagrostis Canadensis (Michx.) Beauv. Blue Joint-grass. M. p. 



112. Wet grounds. Summer. 



Montgomery — Praser 's Bog (VP.). Bucks — Durham, Ruth (Pr). 

 Delaware— Rhoads Swamp (Pu.), Tinicum (VP.), Concord (W. Tr.). 

 Lancaster — (P.). Lehigh— Coplay (Kr.). Northampton— JZaaton, Porter 

 (B.C.). Douphm—(P.). 



Gloucester— Near Mickelton (He.), Tomlin (Ja.). Atlantic — Egg Har- 

 bor (Sts.). M onmout h— Squan and Shark Rivers (C). 



New Castle — Eli Crbssons, near Bear Station. 



2. Calamagrostis cinnoides (Muhl.) Scribn. Reed-grass. M. p. 113. 



Moist ground. Summer. 



Bucks— Durham, Ruth (Fr.). Montgomery— Praser 's Bog, Willow 

 Grove (VP.). Delaware— Tinicum, A. H. Smith (Fu.). Chester— (P.). 

 Lancaster — (P.) . Dauphin— (P.) . 



Camden— Lindenwold (VP.). Gloucester— Mickleton (He.), Tomlin 

 (Ke.), Swedesboro (Li.). 



New Castle— Brandywine, etc. Scarce. 



