Carex 



Cyperaceae 



269 



Carex oligosperma Michx. 



o 13 



Map 563 



Carex Grayii Carey 



and spreading or ascending ; in C. lurida the teeth are erect or appressed, 

 the perigynia are more abruptly beaked and the beak is longer and 

 narrower. 



N. S. to Minn., southw. to Fla., Tex., and Vera Cruz, Mex. 



41. § LUPULINAE 



Pistillate spikes globose to short-ovoid; style straight or the bend remote from the 



achene. 



Perigynia radiating in all directions, cuneate at the base, subcoriaceous, usually 



somewhat hispidulous; staminate spike usually subsessile or short-peduncled; 



achenes obscurely trigonous, almost suborbicular in cross section, the angles 



inconspicuous 134. C. Grayii. 



Perigynia ascending, rounded at the base, membranaceous, smooth and shining; 

 staminate spike normally long-peduncled; achenes with blunt angles but con- 

 spicuously trigonous. 



Perigynia broadly ovoid, about half as broad (5-8 mm) as long 



135. C. intumescens. 



Perigynia narrowly ovoid, a fourth to a third as broad (3.5-5 mm) as long 



135a. C. intumescens var. Fernaldii. 



Pistillate spikes oblong to cylindric; style abruptly bent immediately above the achene. 



Achenes conspicuously longer than wide, the angles not prominently knobbed, the 



sides shallowly concave; pistillate spikes short-oblong to oblong-cylindric. 



Culms arising one to few together from elongate rootstocks; staminate spike 



narrow, 2.5 mm wide, very long-peduncled; pistillate scales blunt to acute, 



rarely short-mucronate; leaf blades 2-6 mm wide 136. C. louisianica. 



Culms cespitose; staminate spike 3-5 mm wide, sessile or short-peduncled; pistillate 



scales acuminate to rough-awned; leaf blades 4-15 mm wide 



137. C. lupulina. 



Achenes not longer than wide, the angles prominently knobbed, the sides deeply 

 concave; pistillate spikes cylindric or oblong-cylindric. 

 Perigynia ascending or slightly spreading, the beak less than twice the length 



of the body; achenes about as wide as long 138. C. lupuliformis. 



Perigynia widely spreading at maturity, the beak 2-3 times the length of the body; 

 achenes much wider than long 139. C. gigantea. 



134. Carex Grayii Carey. (Carex Grayii var. hispidula Gray and 



