SEDGE FAMILY 139 



lateral spikes 2-3, pistillate, sessile to slender-peduncled, approximate, 12-48 

 mm. long, 5 mm. wide; scales lanceolate, sharp-pointed; perigynia obovoid, 

 nerveless, abruptly minutely beaked. Low ground: B.C. 'Mont. Utah Calif. 

 Submont. Je-S. 



135. C. lenticularis Michx. Densely cespitose; culms 3-6 dm. high, some- 

 what roughened; staminate spikes 1-2, often partly pistillate; pistillate spikes 

 2-5, sessile or short-peduncled, approximate or lower remote, 1-5 cm. long, 3-4 

 mm. wide; scales obtuse, with broad light-colored center; perigynia 2.5 mm. long, 

 1.5 mm. wide, minutely beaked. River and lake shores: Lab. Mass. 'Minn. 

 Sask. Boreal. Je-S. 



136. C. Kelloggii W. Boott. Cespitose; culms 3-7 dm. high, slender, some- 

 what roughened; staminate spike usually 1; pistillate spikes 3-5, sessile or nearly 

 so, approximate or slightly separate, linear. 1.5-4 cm. long, 4-6 mm. wide; scales 

 obtuse'or acutish, with broad light-colored center; perigynia 2.5 mm. long, 1.25 

 mm. wide, abruptly minutely beaked. C. vulgaris var. lipocarpa Holm. Alaska 

 Ida. Colo. Utah Calif. Submont. Mont. Je-Au. 



137. C. aquatilis Wahl. Rootstock slender, stoloniferous; culms 2-7 dm* 

 high, sharply triangular above, slender, reddened at the base; leaf -blades 2-4 

 mm. wide; staminate spikes 1-2, slender; pistillate spikes 2-4, sessile or short- 

 peduncled, separate, linear, 1.5-6 cm. long, 4-6 mm. wide; scales oblong-obovate 

 to lanceolate, obtuse or acutish, blackish, 1-nerved; perigynia elliptic-obovate, 

 2.5 mm. long, 1.25 mm. wide, nerveless, but with a median ridge, sub-stipitate, 

 puncticulate, reddish-dotted all over, granular, very minutely beaked. C. vari- 

 abilis Bailey. C. rhomboidea Holm. Wet meadows and swamps: Lab. 'Que. 

 N.M. Calif. Yukon; Eurasia. Mont. Subalp. Je-Au. 



138. C. substricta (Kukenth.) Mackenzie. Cespitose and stoloniferous; 

 culms 6-14 dm. high, sharply triangular, reddened at the base; leaf -blades 

 often glaucous, 4-8 mm. wide; staminate spikes 2-3, slender; pistillate spikes 

 2-4, sessile or short-peduncled, separate, linear, 2-7 cm. long, 4-6 mm. wide; 

 scales lanceolate, sharp-pointed, reddish brown with broad light-colored center, 

 narrower than the perigynia; perigynia 3 mm. long, obovate, tapering to the 

 stipitate base, obscurely nerved, but the marginal nerves prominent, resinous- 

 dotted, abruptly very minutely beaked. C. aquatilis Am. auth., not Wahl. 

 Swamps: Me. N.Y. Neb. -Sask. Plain. Je-Au. 



139. C. nebraskensis Dewey. Rootstocks creeping and stoloniferous; 

 culms 2.5-10 dm. high; leaf-blades 4-8 mm. wide, flat; staminate spikes 1-2; 

 pistillate spikes 2-5, sessile or short-peduncled, 1.5-6 cm. long, 6-9 mm. wide, 

 contiguous or the lower separate; scales lanceolate, obtusish to acuminate, 

 blackish with light midvein; perigynia ascending, 3-3.5 mm. long, 2 mm. wide, 

 rounded at the base. Meadows and swamps: S.D. Kans. N.M. 'Calif. 

 B.C. Plain Submont. My-Jl. 



140. C. Emoryi Dewey. Cespitose, long stoloniferous; culms 5-10 dm. 

 high, sharply triangular, rarely reddened at the base; leaf -blades green, 3-7 mm. 

 wide; staminate spikes 1-3, slender; pistillate spikes 2-4, sessile or short-ped- 

 uncled, more or less strongly separate, narrowly linear, 4-10 cm. long, 3-5 mm. 

 wide; scales lanceolate, sharp-pointed, with broad light-colored center and hya- 

 line margins, narrower than the perigynia; perigynia very numerous, oval or 

 ovate, 2.5 mm. long, rounded at the base, sessile or substipitate, few-nerved, 

 the marginal nerves not prominent, puncticulate, abruptly minutely but notice- 

 ably beaked. Swales and river banks: N.J. D.C. Tex. N.M. Colo. 

 N.D. Man. Plain Submont. 



141. C. prionophylla Holm. Rootstocks thick; culms 5-9 dm. high, strongly 

 aphyllopodic and reddened at base, wing-angled and serrulate; leaf-blades 

 flat, 4-5 mm. wide, very scabrous; spikes 4-5, the terminal staminate, the 

 lateral pistillate, contiguous or the lower separate, sessile or short-peduncled, 

 1-2 cm. long, 3-4 mm. wide; lowest bract dark-auricled ; scales oblong-ovate; 

 perigynia appressed, 2.5 mm. long, obovate, green, obscurely nerved, abruptly 

 minutely beaked. Mountain streams: Ida. Wash. Submont. Jl. 



