145. Cyperaceae 317 



9. Lateral spikes 1-2, ellipsoid, 5-8 inin thick; perigynia 



nearly equalling the acute or nuicronate glumes; 

 bogs; Peoria and Tazewell counties, Brendel, and in 

 the n.e. counties C. limosa L. 



8. Spikes ascending or erect. 



10. Terminal spike gynecandrous; leaves and base of 



stem usually more or less pubescent. 



11. Perigynia beakless, 2-3.5 mm long; leaves 1.5-4 

 mm wide. 

 12. Perigynia appressed-ascending, much wider 

 than thick, obtuse; dry woods and meadows 



throughout 111 C. hirsutella Mack. 



12. Perigynia spreading, nearly as thick as wide, 

 acute. 

 13. Sheaths glabrous or nearly so; low, wet 

 woods, local C. caroliniana Schw. 



13. Sheaths pubescent; meadows and woods; 



s. Ill C. hushii Mack. 



11. Perigynia 3.5-6 mm long, ellipsoid, ascending, the 



beak short; glumes acuminate to awned; leaves 



3-8 mm wide. 



14. Glumes awned; mature perigynia 5 mm long; 



roadside ditches and alluvial soil in woods, 



frequent C. davisii Schw. & Torr. 



14. Glumes acuminate; perigynia 3.5-4 mm long, 

 swampy woods. Union Co., R. H. Mohlen- 



brock & J. W. Voigt in 1955 



C. oxylepis Torr. & Hook. 



10. Terminal spike staminate. 



15. Perigynia tapering at the base, triangular in cross- 

 section. 

 16. Pistillate glumes mucronate or awned; stems 

 phyllo])odic; stolons deep-seated; plants of 

 open marly or sandy soil. 

 17. Pistillate spikes cylindrical, 3-4.5 mm 



thick; sandy soil, n. Ill 



C. tetanica Schk. 



17. Pistillate spikes ellipsoid, 5-8 mm thick; 

 meadows and prairies chiefly in the 

 northern half of 111 C. meadii Dewey 



16. Pistillate glumes obtuse; pistillate spikes 3-4 

 mm thick; stems aphyllopodic; stolons su- 

 perficial; woodland plants, rare 



C. woodii Dewey 



15. Perigynia rounded at the base, nearly terete in 

 cross-section. 



