396 North American Cyperacea. 
absence of a foliaceous bract at the base of the lowest spike, 
since both forms are frequently met with in the same clump. 
The following species, although nearly allied to C. straminea, 
seems wholly distinct. It is singular that it has been so long 
overlooked. 
39. Carex alata. 
Spikes (large) 4 — 7, somewhat globose-ovate, approximate, 
many (80 — 100) flowered ; fruit suborbicular, with a short 
abrupt acumination, very broadly winged, minutely serrulate- 
ciliate on the margin, one-third longer than the lanceolate 
mucronate scale ; nut oval, acute at each end, long stipitate. 
Culm 3 — 4 feet high, stout, glabrous. Leaves dark green, flat, 2 — 3 
lines wide. Sjyikes light green, nearly three-fourths of an inch long, 
thick, ovate or subglobose, somewhat attenuate or turbinate at the base 
owing to the rather numerous staminate flowers. Fruit nearly 2 lines 
broad. Nut elevated on a distinct slender stipe. 
Hab. Newbern, North Carolina, Mr. Croom ! ; Macon, 
Georgia, Dr. Loomis ! 
40. C. BicoLOR, AUioni ; SchuJchr, car. f. 181 ; Schw. ^ 
Tor?: ! car. I. c. p. 311. 
Hab. Labrador, Schweinitz ! 
* * Terminal spike androgj-nous, the others wholly pistillate. 
41. C. GLAREOSA, WciM.; SchiiTihr. car. f. 97. 
Hab. Greenland, Prof. Hornemann ! 
♦ * 
* Staminiferous and pistilliferous spikes distinct. 
t Staminate spike mostly single. 
42. C. aurea, Nutt. gen. 2. p. 205 ; Schw. Sf Torr. ! car. 
I. c. p. 238, t. 25. f. 2. 
C. pyriformis, Schto. ! anal. tab. I. c. 
