CYPERACEAE 49 



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

 very abundant. May- June. 



12. C. stricta Lam. 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, '-2' long, 2 // -3 // broad, nearly 

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

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

 prairies throughout. Locally common. May-June. 



Var. angustata (Boott) Bailey. Pistillate spikes often 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 l /x or less wide : sheaths not fibrillose: pistillate spikes 6 // -14 // 

 long, 2 X/ 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, \\ ff 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, \ f -\\ f long, 2 /x in diameter : perigynia flat, orbicular, nerve- 

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

 June. 



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

 spikes 2-5, sessile, contiguous, short-oblong, 3 /x -8 /x long, 3 r/ wide : peri- 

 gynia \"-\" long, flat, oval, few-nerved, beakless, longer than scales. 

 In dry copses near Leeds and Independence. Not common. 



17. C. Davisil Schwein. & Torr. H-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 // -3 // wide, the latter overtopping the spikes : staminate spikes 

 solitary, small and sessile : pistillate spikes 3-5, 5 x/ -8 /x long, oblong, com- 

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

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

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



19. C. amphibola Steud. Culms slender, l-2i high : leaves l // -2 // 

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

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



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