76 FLORA OF PHILADELPHIA. 



34. ELONGATAE. 



Perigynia radiately spreading, or reflexed when old. 



Perigynia distinctly nerved on both faces, the beak rough. 



Perigynia lanceolate ; beak more than half as long as the body. 



97. C. sterilis. 

 Perigynia ovate; beak about one-third as long as the body, abrupt. 



98. C. Atlantica. 

 Perigynia faintly nerved on the outer face, nerveless or nearly so on the 



inner; beak smoothish. 99. C. interior. 



Perigynia ascending, appressed or somewhat spreading when old, not 

 radiating. 

 Perigynia ovate, oval, oblong or elliptic. 



Bracts short, scale-like or none, the lowest occasionally longer than 

 the spike. 

 Heads silvery green or nearly white. 100. C. canescen.s. 

 Heads brown or brovmish. 101. C. hrunnescens. 



Bracts bristle-form, much elongated, much exceeding the 2-4 oblong 

 nerved perigynia. 102. C. trisperma. 



Perigynia lanceolate or ovate-lanceolate. 103. C. bromoides. 



35. OVALES. 



Perigynia lanceolate or ovate-lanceolate, 2-5 times as long as wide. 



Perigynia broadly winged; staminate flowers intermixed with the pis- 

 tillate. 104. C. siccata. 

 Perigynia narrowly winged; staminate flowers all basal. 

 Spikes oblong or oval ; perigynia ascending or erect. 



Spikes green-brown, blunt. 105. C. tribuloides. 



Spikes bright brown, pointed; perigynia lanceola.te. 



106. C. scoparia. 

 Spikes subglobose; perigynia spreading, at least when old. 



107. C. cristatella. 

 Perigynia ovate, not more than twice as long as wide (longer in some forms 



of 110). 

 Perigynia narrowly winged above; heads greenish-brown. 



108. C. adusta. 

 Perigynia broadly wing-margined. 



Perigynia spreading or ascending. 



Spikes silvery green. 109. C. foenea. 



Spikes yellowish-brown or greenish. 110. C. straminea. 

 Perigynia erect or appressed. 



Heads silvery green or nearly white; sea-beach species. 



111. C. silicea. 

 Heads brown-green; meadow or marsh species. 



112. C. tenera. 

 Perigynia orbicular, very broadly ovate or somewhat obovate, sometimes 



wider than long. 

 Heads green-brown. 



Perigynia spreading or ascending; achene sessile. 



113. C. festucacea. 

 Perigynia erect, 4-5 mm. broad; achene short-stalked. 



114. C. alata. 

 Heads silvery green, yellowish or whitish. 115. C. albolutescens. 



1. Carex Collinsii Nutt. M. p. 191. Bogs. Summer. 

 C}iester—(P.). 



Burlington — StaSoT A Forge (St.), Brown Mills (Te.). Camden — 

 Griffith's Swamp, Mart. (B. C), Cedar Brook (Cr.) (Ke.), Gloucester 

 (Sa.), Atco (Te.), Clementon, Lindenwold (VP.). Gloucester — Near 

 Malaga (C), near Miekleton (He.), Swedesboro (Li.), Washington Park 



