52 CYPERACEAE 



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

 ish-yellow, l x/ 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, f-2' 

 long, the bracts conspicuous or inconspicuous : perigynia \\" long, 

 bright-yellow, ovate-elliptic or suborbicular, 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, l x/ 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, 1-1J 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, 1J" long. Rather 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, l -!^ high : spikes closely 

 aggregated, the lower one or two separated : perigynia \\" long, ovate- 

 lanceolate, corky-thickened at the base, feflexed at maturity. Woods 

 near Courtney. May-June. 



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

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

 ovate, \\ r/ 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 /x -4 /x broad : head W-15" long, with spikes commonly distinct 

 but not separated : perigynia 2 X/ 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 l"-2" 

 wide : head 6" long, short-oblong, never interrupted : bracts setaceous : 

 perigynia l/'-lz" long, ovate, nerveless, about the length of the scale. 

 Common in dry ground. May-July. 



43. C. Leaven worthii Dewey. About 1 high : leaves 1" or less 

 wide : head 4 // -8 // long, not interrupted and with short bracts : perigynia 

 less than l x/ long, orbicular-ovate : scale shorter and narrower than the 

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

 June. 



44. C. Muhlenbergii Schk. Culms 1-2J high, longer than the nar- 

 row (l // -2 // wide) leaves : head 9 // -12 // long, the clusters recognizable : 



