6(3 • FLORA OF PHILADELPHIA. 



14. SciRPUS MICROCARPUS Presl. M. p. 179. Swamps and wet woods. 



Summer. 

 jBwcA's— Penn A'alley (Fr.). 



15. SciRPUs POLYPHYLLus Vahl. M. p. 180. Swamps. Summer. 



Bucks— i\ea.T Sellersville (Fr.). Delaware— Y alley of Darby Creek (B. 

 Sm.). Chester— (P.). Laticasler— (P.). jBerAs— Hamburg (Ke.). Dau- 

 phin — (P.). 



Hu7iterdon—'RosemoB.t, Lambertville (C.). 



New Castle — Common. 



16. SciRPUS CYPERiNus (L.) Kunth. M. p. ISO. Swamps. Summer. 



7. ERIOPHORUM L. Cotton-grass. 



Achene obovoid, obtuse ; spikelets umbellate. 1. E. pohjstachyon. 



Acliene linear-oblong, acute ; spikelets capitate or some of them peduncled. 



Leaves channeled or 3-sided ; bristles 4-6 times as long as the scale, 



bright white. 2. E. gracile. 



Leaves tlat; bristles 3 times as long as the scale, brown (rarely white). 



3. E. Virginicum. 



1. Eriophorum polystachyon L. M. p. 182. Bogs. Summer. 



New Castle — Thompsons, not common. 



2. Eriophorum gracile Koch. M. p. 182. Bogs. Summer. 



Bucks — Quakertown, Mart. (B. C), Nockamixon (Cr.) (He.), Rock 

 Hill (Fr.). Delaivare—mioads' Swamp, Marple (Fu.) (B. Sm.). Ches- 

 ter— (P.). Lehigh— Salshmg (Kr.). Northampton— (P.). 



Gloucester— Mickleton (He.). Ocean— Tuckerton (Sts.) (Te.). 



New Castle— 'Delaware Junction, Townsend, Commons. 



3. Eriophorum Virginicum L. M. p. 182. Bogs. Summer. 



8. FUIRENA Rottb. Umbrella-grass. 

 1. Fuirena SQUArrosa Michx. M. p. 182. Wet meadows and marshes near 



the coast. Summer, 

 la. Fuirena squarrosa hispida (Ell.) Chapm. M. p. 182. Sandy, wet 

 places. Summer. 

 Ca?nden— Ballast and Petty 's Island (C). Cape May— Cape May (Cr.) 

 (Li.), Beesley's Point (He.), Anglesea (Li.). Atlantic— May 's Landing 

 (C). Ocean — Toms River (C), Forked River (He.) (Wn.). Monmouth 

 —Long Branch (Fu.), Ocean Beach, Ocean Grove, Spring Lake (C). 



9. RYNCHOSPORA Vahl. 



Style entire or 2-toothed, persistent as a long-exserted beak. 



1. B. corniculata. 

 Style deeply 2-cleft, only its base persistent as a tubercle. 



Bristles minute or wanting. 2. B. pallida. 



Bristles downwardly barbed or rarely smooth. 



Scales white or nearly so ; bristles 9-15. 3. B. alba. 



Scales brown ; bristles 6. 



Leaves filiform; achene oblong. 4. E. capillacea. 



Leaves narrowly linear, flat ; achene obovate. 



Bristles equalling the achene ; tubercle one-half as long or 

 less. 5. B. Enieslcernii. 



Bristles reaching or exceeding the end of the tubercle, 

 which is as long as the achene. 



