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 straniinea, 

 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. Spikes light green, nearly three-fourths of an inch long, 

 thick, ovate or gubglobose, 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. BicoLDR, Allioni ; SchttJchr, car. f. 181 ; Schw. ^ 

 Torr. ! car. I. c. p. 311. 



Hab. Labrador, Schweinitz ! 



* * Terminal spike androgynous, the others wholly pistillate. 



41. C. GLAREOSA, WttJiI. ; SchtiMr. car. f. 97. 

 Hab. Greenland, Prof. Hornematm ! 



* * * Staminifernus 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, Schw. ! anal. tab. I. c. 



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