530 CYPERACEJt. ($>(> FAM1L1.J 



bracts long and leftf-like, with very short sheathing hnscs, much exceeding the 

 culm (about equal to it in Xo. 106) : ataiuinate spiLes 1 -5 



* Perigynia with a very sJtort and thick brak, and irith short and (hick sl'fjitty 



spreading tttih . L A ci s T n :; s . 



106. C. striTita, Michx. (not of cd. 1.) Sterile spikes 2 -3, the upper- 

 most stalked ; fertile spikes 1-2, ol)long, erect, remote, on very short stalks ; peri- 

 gynia ocoid, abruptly contracted into a slightly serrulate beak, longer than the point- 

 ed purple sciile. (C. polyraorpha, ed. 1.) Wet places, New Jersey to Vir- 

 ginia, and southward. 



107. C. lacustris, Willd. Sterile spikes 2-5, the uppermost stalked; 

 fertile spikes 2-3, oblong-cylindrical, stout, erect, remote, nearly sessile, or the low- 

 est on a short stalk ; perigynia oblong, but little exceeding the lanceolate awacd 

 scale ; culm sharply triangular, rough ; sheaths very short, smooth. (C. riparia, 

 MultL, not of Curtis.) Swamps and borders of lakes and rivers; common. 

 A robust species, 3 -5^ high, with leaves % - 1' wide. 



* # Perigynia with an elongated tapering beak, and long widely spreading or recurve I 



sharp and spine-like teeth. ARIST.\TJE. 



- S'aminatfi spikes 2-5, some occasionally bearing a few fertile, floicers. 

 103. C. aristtEt:!, R. Brown. Fertile spik<s 2-4, cylindrical, erect, re- 

 mote, the lower on partly exserted short stalks ; perigynia tapering from an ocoia 

 base into a deeply 2 forked beak, longer than the ovate-lanceolate awncd scale 

 culm smooth; slienths and under surface of the leaves jmbcscfiit. (C. athcrodea 

 Spreng.} Lake shores and river-banks, N. New York to Michigan, and north- 

 westward. Culm 2 - 3 high : leaves 2" - 3'' wide. Fertile spikes 2' - 3' long 

 often rather loosely flowered towards the base. 



109. C. trichOC&rpa, Muhl. Fertile spikes 2 - 3, (Wong-cylindrical, erect, 

 remote, one of them sometimes staminate at the apex, the lower on exserted 

 stalks, rather loosely flowered towards the base ; perigynia very hairy, shaped as 

 the last, longer than the ovate taper-pointed light-brown scale ; culm sharply 

 triangular, smooth except near the top, sheaths and under surface of the leave* 

 smooth. (C. striata, ed. 1, not of Alichx.) Marshes and lakes; common, es- 

 pecially northward. 



*- *- Staminate spike solitary, with a filiform bract, occasionally bearing a few 

 fertile flowers towards the apex or base : fertile spikes 3-5, cylindrical, dense- 

 ly flowered, on long exserted and at length drooping stalks : perigyuia widely 

 spreading, reflcxcd at maturity. 



110. C. couiosa, Boott. Fertile spikes large (1|'-2|' long, and }'-' 

 wide), the lowest sometimes very remote; perigynia tapering from a stalked ovoid' 

 triangular base into a long deeply 2-forked beak, (he sharp elongated teeth widdy spread- 

 ing or somewhat recurved ; scales lanceolate with a long bristle-shaped awn 

 chortcrthun the mature fruit ; culm rough and triquetrous. (C. furcata, Ell., 

 not otLapeyr. C. Pseudo-Cypcrus, Schw. fr Torr., Dew., $r., in part, not of L.) 

 Wet places; rather common. A robust species 2 -3 high, formerly con- 

 lounded with the next, which it greatly resembles; but it differs especially in 

 the larger fertile spikes, longer beak of the fruit, and t" -:ncoth and 

 aridely-sprcadiug teeth, giving to the spikes a coinose or bristly appearance. 



