CYPERACEAE 53 



spikes 4-10, globose: perigynia orbicular-ovate, \\" long, not nerved, 

 shorter than the scale. In dry ground near Lee's Summit and Courtney. 

 May- June. Our form is var. Xalapensis (Kunth) Britton. 



45. C. steiilis Willd. Culms 8 / -20 / high : leaves less than 1" wide : 

 spikes 3-5, several-many-flowered, usually separate, the staminate flow- 

 ers usually numerous : perigynia ovate-lanceolate, \\' f long, nerved, 

 tapering into a sharp, rough beak, half the length of the body, longer 

 than the scale. Prairie near Lee's Summit. May- June. 



46. C. Muskingumensis Schwein. Stout culms, 2-3 high : leaves 

 2 x/ wide or less : spikes distinct, light brown, 6" -12" long, oblong- 

 cylindric, many-flowered : perigynia linear-lanceolate, 3 XX --4 XX long, much 

 longer than the scale. In swampy ground near Lake City and Sibley- 

 May-June. 



47. C. tribuloides Wahl. l-3 high : leaves about 2 X/ wide : spikes 

 6-20, short-oblong, truncate at summit, 3 XX -6 XX long, 3 XX -4 XX wide : peri- 

 gynia 2 XX -3 X/ long, lanceolate, ascending or erect, twice the length of the 

 scale. In moist meadows throughout. May- June. 



Var. turbata Bailey. Spikes 3 XX long, 2^ // wide, ovoid-oblong : head 

 1 X -2 X long, the lower spike separated. Low grounds from Sheffield to 

 Sibley. 



48. C. scoparia Schk. Culms l-2 high : leaves about l xx wide : 

 spikes 3-8, brownish, 3 XX -8 XX long, oblong-conic, close together, usually 

 bractless : perigynia 2 XX -3 XX long, lanceolate, erect or ascending, longer 

 than the scale. Common on prairies near Waldo Park, Lee's Summit and 

 Atherton. June. 



49. C. cristatella Britton. Culms H-3 high : leaves H XX -2 XX wide : 

 spikes 6-15, globular, 2 XX -3 XX long, contiguous : perigynia 1^ XX -2 XX long, 

 ovate-lanceolate, spreading or ascending, their points conspicuous, much 

 longer than the scale. Common in low meadows and thickets. May- 

 June. 



50. C. straminea Willd. Culms l-3 high: leaves | XX -2 XX wide: 

 spikes 3-8, globular, 3 XX -4 XX broad, distinct : perigynia l^ xx long, ovate, 

 wing-margined, ascending or spreading, exceeding the scale. Infre- 

 quent in woods. Our form is var. mirabilia (Dewey) Tuckerm. May- 

 June. 



51. C. festucacea Willd. Culms stiff and erect, l-3 high : leaves 

 l//_o// w i(i e : spikes 3-8, 3 XX -5 XX broad, greenish-brown, oblong to globu- 

 lar, contiguous, short-bracted : perigynia orbicular, broadly margined, 

 l xx long, ascending, about the length of the scale. Common in open 

 grounds. May-June. 



52. C. Bicknellii Britton. Culms 2-4 high : leaves l^ xx -2^ xx wide: 

 spikes 3-7, 4 X/ -6 X/ long, ovoid, silvery-green, close together : perigynia 

 orbicular, strongly winged, 2 XX -3 XX long. Frequent in dry or wet open 

 grounds throughout. May-June. 



