SEDGE FAMILY 117 



28. Albae. 

 Represented by one species in our range. 90. C. eburnea. 



29. BiCOLORES. 



Mature perigynia wliitish, ellipsoid, not fleshy or translucent. 91. C. Hassei. 

 Mature perigynia orange or brownish, broader, fleshy, translucent. 



92. C. aurea. 

 30. Paniceae. 



Beak of the perigynia none or very short. 



Sheaths of the bracts short; plant glaucous; leaf-blades involute; spikes approximate 



93. C. livida. 

 Sheaths of the bracts long; plant not glaucous; leaf-blades flat; spikes distant. 



Fertile culm-blades 3-5, 2-3.5 mm. wide; perigynia 3.5 mm. long or less; spikes 

 linear. 94. C. tetanica. 



Fertile culm-blades 6-10, 3-7 mm. wide; perigynia longer; spikes oblong or linear- 

 oblong. 95. C. Meadii. 

 Beakof the perigynia straight, prominent. 96. C. vaginata. 



31. Laxiflorae. 



Represented by one species in our range. 97. C. blanda. 



32. Granulares. 



Plants cespitose; bracts elongate, overtopping the spikes; staminate spike short-stalked. 



98. C. Shriveri. 

 Plants with long-creeping rootstocks; bracts short, rarely overtopping the spikes; stam- 

 inate spike long-stalked. 99. C. Crawei. 



33. Debiles. 



Represented bj one species in our range. 100. C. Assiniboinensis. 



34. Capillares. 



Represented by one species in oiu- range. 101. C. capillaris. 



35. LONGIROSTRES. 



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



36. Frigidae. 

 Terminal spike staminate or gj-naecandrous, the lateral ones pistillate. 



Ternunal spike usually gynaecandrous, the lateral ones ovoid or short-oblong. 



103. C. misandra. 

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

 cylindric. 

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



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. 

 Perigynia 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. ANOMAL.U5. 



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



39. LlMOS.\E. 



Pistillate spikes drooping. 



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



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

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



gynia. IH. c. paupercula. 



Pistillate spikes erect. 112. C. Buxbaumii. 



40. Atratae. 



■ Terminal spike in some plants pistillate and linear-cylindric or staminate only at apex, 

 in others staminate. 

 Scales not long-pointed, little exceeding the perigynia; perigynia flattened, sharp- 

 edged. 113. C Parryana. 

 Scales long-pointed, 2-3 times as long as the perigynia; perigynia little flattened. 

 ^ 114. C. idahoa. 

 Termuial spike staminate or gynaecandrous, not pistillate and linear-cylindric. 

 Terminal spike staminate. 



Cxilms few-leaved, strongly aphyllopodic, purplish 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; pistillate scales with strong midvein; 

 perigynia 2-nerved. 116. C. venustula. 



Staminate scales with conspicuous more or less excurrent midvein. 



117. C. spectabilis. 



