SEDGE FAMILY 47 



33. Debiles. 

 Represented b> one species in our range. 100. C. Assiniboinensis. 



34. Capillares. 

 Represented by one species in our range. 101. C. capillaris. 



35. LONGIROSTRES. 



Represented by one species in our range. 102. C. Sprengelii. 



36. Frigidae. 

 Terminal spike staminate or gjTiaecandrous, the lateral ones pistillate. 



Terminal spike usually gj-naecandrous, the lateral ones ovoid or short-oblong. 



103. C. misandra. 

 Terminal spike staminate (or with a few perigytiia), the lateral ones oblong or linear- 

 cyUndric. 

 Perigynia triangular, slightly compressed. 104. C. luzuUna. 



Perigynia strongly compressed. 105. C. tissuricola. 



Terminal spike androgynous, the upper lateral staminate, the lower pistillate. 



Perigynia lanceolate, 1.5 mm. wide, tapering to the apex; spikes 2-5, usually 4. 



106. C. petricosa. 

 Perig>-nia oblong-oval, 2.25 mm. wide, abruptly minutely beaked; spikes more 

 numerous. 107. C. Franklinii. 



37. Pallescentes. 

 Represented by one species in our range. 108. C. abbreviata. 



38. ANOiL^LAE. 



Represented by one species in our range. 109. C. a7nplifolia. 



39. LlMOSAE. 



Pistillate spikes drooping. 



Plants strongly stoloniferous ; leaf-blades involute, glaucous, 3 mm. wide or less; 



scales little exceeding the perigynia. 110. C. limosa. 

 Plant tufted; leaf-blades flat, not glaucous, wider; scales much exceeding the peri- 



gjTiia. 111. C. pauper cula. 



Pistillate spikes erect. 112. C. Buxbaumii. 



40. Atratae. 



Terminal spike in some plants pistillate and linear-cylindi'ic or staminate only at apex, 

 in others staminate. 

 Scales not long-pointed. Little exceeding the perigj-nia; perigynia flattened, sharp- 

 edged. 113. C Parryana. 

 Scales long-pointed, 2-3 times as long as the perigjTua; perigj-nia little flattened. 



114. C. idahoa. 

 Terminal spike staminate or gj-naecandrous, not pistillate and linear-cj-lindric. 

 Terminal spike staminate. 



Culms few-leaved, strongly aphyllopodic, purpUsh tinged at base. 

 Staminate scales obtuse, the midvein nearly or quite obsolete. 



Staminate scales obovate; pistillate scales with obsolete (or nearly so) 



midvein; perigynia nerveless. 115. C. podocarpa. 



Staminate scales "linear-lanceolate; pistiUate scales with strong midvein; 

 perigynia 2-nerved. 116. C. venustula. 



Staminate scales with conspicuous more or less excurrent midvein. 



117. C. spectabilis. 

 Culms many-leaved, clothed at base with dried-up leaves of previous year, not 

 purplish tinged at base. 

 Perigynia flat. 118. C. Tohniei. 



PerigjTiia round in cross-section, many-nerved. 119. C. Raynoldsii. 



Terminal spike gynaecandrous. 



Perigynia triangular in cross-section, nerveless or nearly so, 2.5 mm. long or less. 



120. C. Halleri. 

 Perigynia longer, many-nerved or with two prominent marginal nerves, more or 

 less strongly flattened. 

 Spikes contiguous, sessile or short-peduncled, forming a dense head; culms 

 stiff, erect. 

 Perigynia subinflated-triangular, scarcely compressed, the beak 1 mm. 



long. 121. C. Nelsonii. 



PerigjTiia strongly compressed, the beak 0.5 mm. long. 



Lowest spike slightly separate, short-peduncled; scales black, with 

 very conspicuous white hyaline apex and upper margins. 



122. C. albo-nigra. 

 Spikes closely contiguous and sessile; scales black with inconspicuous 

 hyaline apex and margins. 123. C. nova. 



Lowest spike (or spikes) strongly peduncled, usually distant, erect or nodding. 

 Spikes 3-5, not oblong-cylindrij; walls of the perigynia not papery; peri- 

 gynia 2.5-4.5 mm. long, nerveless or obscurely nerved on the face, 

 dull green to brownish black; scales from a little shorter to a little 

 longer than the perigynia. 

 Perigynia slightly inflated and sub-triangular, not strongly compre.ssed. 



124. C. atrosquama. 

 Perigynia strongly compressed. 



Perigynia sharp-edged, the margins much narrower than the achene; 

 lateral spikes Imear. 

 Scales shining, with the midvein conspicuous the whole length, 

 exceeded by the perigynia. 125. C. bella. 



