52 CYPERACEAE 



long, densely flowered : bracts setaceous : perigynia broadly ovate, green- 

 ish-yellow, V'' long, tipped by a two-toothed beak, half the length of the 

 body. — Common in moist soil throughout. May-June. 



36. C. xanthocarpa Bicknell. Resembles the last : head dense, ?/-2' 

 long, the bracts conspicuous or inconspicuous: perigynia IV^ long, 

 bright-yellow, ovate-elliptic or subor])icular, tipped with a minutely 

 two toothed beak. — Frequent in low grounds throughout. May- 

 June. 



37. C. Sartwellii Dewey. Culms l°-3° high, exceeding the long- 

 attenuate leaves : head l'-3^ long, narrow and somewhat separated : 

 bracts setaceous, usually small : spikes 2"-4'^ long : perigynia lance- 

 elliptic, V'' long, contracted into a short beak : scales blunt, pale-brown, 

 and hyaline tipped. — Low meadows west of Lake City. 



38. C. rosea Schk. Culms bright green, l°-l2° high, weak and 

 often reclining : leaves narrow : spikes 5-8, 5-16-flowered, the upper 

 aggregated, the lower 2-4 widely separated : perigynia widely radiating, 

 lance-ovate, flat, bright green, IV^ long. — Kather common in dry woods. 

 May-June. 



Var. radiata Dewey. Spikes 2-5, only 2-6-flowered. — With the type 

 but more common. May-June. 



39. C. retroflexa Muhl. Erect culms, 1°-1A° high : spikes closely 

 aggregated, the lower one or two separated : perigynia U^^ long, ovate- 

 lanceolate, corky-thickened at the base, reflexed at maturity. — Woods 

 near Courtney. May-June. 



40. C. sparganioides Muhl. Culms sharply 3-augled, 2°-3° high : 

 leaves 3'^-4^^ broad : spikes 6-12, more or less separated : perigynia 

 ovate, \Y^ long, wing-margined, longer than the scale. — Rich woods 

 throughout. May-July. 



41. C. cepha oidea Dewey. Culms erect but not stiff, 2°-3° high : 

 leaves 2'^-4^' broad : head 9^^-15^' long, with spikes commonly distinct 

 but not separated : perigynia 2^^ long, nerveless, ovate-lanceolate, twice 

 the length of the membranous scale. — Rocky woods along Spring Branch 

 near Pixley's Switch. June. 



42. C. cephalophora Muhl. Erect : culms l°-2° high : leaves V^-2^^ 

 wide : head C long, short-oblong, never interrupted : bracts setaceous : 

 perigynia V'-V." long, ovate, nerveless, about the length of the scale. — 

 Common in dry ground. May-July. 



43. C. Leavenworthii Dewey. About 1° high : leaves \" or less 

 wide : head A"-ii" long, not interrupted and with short bracts : perigynia 

 less than V long, orbicular-ovate : scale .shorter and narrower than the 

 perigynia.— Sandy, bluff woods near Courtney. Locally common. May- 

 June. 



44. C. Muhlenbergii Schk. Culms \°-2\° high, longer than the nar- 

 row (V'-2" wide) leaves : head 9"-12" long, the clusters recognizable : 



