CYPERACEAE 49 



oval, with short beak. — ^Low prairies and swales throughout. Locally 

 very abundant. May-June. 



12. C. stiicta Lara. 2°-4° high : leaves long and narrow, their lower 

 sheaths sometimes prominently fibrillose : staminate spikes 2 or more: pis- 

 tillate spikes 2-5, densely flowered, h^-2^ long, 2^^-3^^ broad, nearly 

 sessile, the upper often staminate above : perigynia ovate, V^ long, 

 minutely beaked: scales about length of perigynia. — Low swales and 

 prairies throughout. Locally common. May-June. 



Var. angustata (Boott) Bailey. Pistillate spikes often 4' long, erect : 

 scales usually longer than perigynia. — With the type but rarer. May- 

 June. 



13. C. Haydeni Dewey. Like the last : culms lower and more slender, 

 leaves V^ or less wide: sheaths not fibrillose: pistillate spikes 6''^-14^'' 

 long, 2^^ or less wide, sessile : staminate portion small : perigynia ovate- 

 orbicular. — Low wet prairies west of Lake City. Rare. May-June. 



14. C. gynandra Schwein. 2°-5° high : staminate spikes usually 2 : 

 pistillate spikes 3-6, narrowly cylindrical, 2^-4^ long, 3'^-4'^ wide, 

 curved and drooping : perigynia ovate, elliptic, acute, 1]'^ long, nerve- 

 less, much shorter than the subulate scale. — In a swale along the railroad, 

 a mile east of Courtney. A few clumps. May-June. 



15. C. Shortiana Dewey. Culms l°-3° high : spikes 3-5, approxi- 

 mate at summit of culm, very densely flowered, the uppermost staminate 

 at base, V-iy long, 2^^ in diameter : perigynia flat, orbicular, nerve- 

 less, minutely beaked. — Common throughout in low grounds. May- 

 June. 



16. C. hirsuta Willd. 1°-1t° high : leaves and sheaths pubescent: 

 spikes 2-5, sessile, contiguous, short-oblong, 3''-8^^ long, 3'^ wide : peri- 

 gynia y^-V^ long, flat, oval, few-nerved, beakless, longer than scales. — 

 In dry copses near Leeds and Independence. Not common. 



17. C. Davisii Schwein. & Torr. lA°-3° high : leaves 2'^-3'^ wide, 

 sparingly pubescent : spikes 3-5, all long-stalked and spreading, the 

 uppermost staminate at base, 6'' ''-18'''' long, 3^^ wide : perigynia 2^^ long, 

 ovoid, inflated and strongly nerved, the beak minutely 2-toothed : scales 

 lanceolate, conspicuously long-awned. — Rather common in moist thickets 

 and woods throughout. May-June. 



18. C. grisea Wahl. l°-2° high, slightly glaucous : leaves and 

 bracts 2^^-32^^ wide, the latter overtopping the spikes : staminate spikes 

 solitary, small and sessile : pistillate spikes 3-5, 5'^-8'^ long, oblong, com- 

 pact, the upper sessile, the lower peduncled : perigynia 2Y^ long, oblong, 

 beakless and finely striate : scales cuspidate. — Low woods along the 

 Little Blue River west of Lake Citj'. Not common. May-June. 



19. C. amphibola Steud. Culms slender, l°-2.l° high : leaves V^-2^^ 

 wide : staminate spike solitary, peduncled : pistillate spikes 2-5, 6^^-12^^ 

 long, slender, loosely several-flowered, all peduncled : perigynia 2^^ long, 



4 



