14 THE GENUS CAREX IN CALIFORNIA 



13. Canescentes. 



Spikes androgynous; perigynia unequally biconvex 56. C. disperma. 



Spikes gynsecandrous; perigynia plano-convex. 



Perigynia broadest near middle, short-beaked, smooth or little roughened 57. C. canescens. 



Perigynia ovate, broadest near the base; beak conspicuous, strongly serrulate 58. C. arcta. 



14. Polytrichoideae. 



Represented by one species 59. C. leptalea. 



15. Firmiculmes. 



Not stoloniferous; culms smooth, terete; leaf-blades 1.5 mm. wide; bracts long-awned 



...60. C. multicaulis. 



Stoloniferous; culms very rough, triangular; leaf-blades 2-3.5 mm. wide; bracts not long-cuspidate 



61. C. Geyeri. 



16. Filifolise. 



Represented by one species in our range 62. C. exserta. 



17. Scirpinee. 



Represented by one species in our range 63. C. gigas. 



18. Mont an ae. 



Basal spikes not developed 64. C. inops. 



Basal spikes present. 



Perigynia finely many-ribbed as well as strongly 2-keeled. 



Scales purplish-tinged, obtuse to cuspidate; body of perigynium globose; staminate spikes 



many-flowered; basal pistillate spikes on elongated very slender peduncles 



65. C. globosa. 



Scales reddish-brown tinged, cuspidate or long-awned; body of perigynium oval; staminate 

 spikes few-flowered; basal pistillate spikes on short, erect peduncles. .66. C. Brainerdii. 

 Perigynia strongly 2-keeled, otherwise nerveless. 



Bract of lowest non-basal pistillate spike leaflet-like, exceeding culm, if at all colored, pur- 

 plish-brown tinged at base. 



Perigynia 2.5-3 mm. long, the beak 0.25-0.75 mm. long, shallowly bidentate 



67. C brevipes, 



Perigynia 3-4.5 mm. long, the beak 0.75-1.50 mm. long, bidentate 68. C. Rossii. 



Bract of lowest non-basal pistillate spike squamiform and shorter than culm or, if longer, 

 auriculate and strongly reddish-brown tinged at base 69. C. brevicaulis. 



19. Digitatse. 



Represented by one species in our range 70. C. concinnoides. 



20. Bicolores. 



Perigynia short-tapering at apex, straw-colored, 2.5-3.75 mm. long 71. C. salinceformis. 



Perigynia rounded or truncate at apex, orange-colored or white-pulverulent, smaller. 



Mature perigynia whitish, ellipsoidal, not fleshy or translucent 72. C. Hassei. 



Mature perigynia orange or brownish, broader, fleshy or translucent 73. C. aurea. 



21. Paniceae. 



Perigynia beakless or nearly so; bract sheaths short; plant glaucous; leaf-blades narrow, involute 



74. C. livida. 



Perigynia strongly beaked; bract sheaths long; plant not glaucous; leaf-blades broad, flat 



75. C. calif ornica. 



22. Laxifiorae. 



Represented by one species in our range 76. C. Hendersonii. 



