12 THE GENUS CAREX IN CALIFORNIA 



7. Multiflorae. 



Scales strongly hyaline-margined; sheaths normally not cross-rugulose. 



Perigynia lanceolate-ovate, sharp-margined to base, membranaceous, straw-colored 



12. C. stenoptera. 



Perigynia ovate, truncate at base, short-beaked, sharp-margined above, not membranaceous, 



brownish-black at maturity 13. C. alma. 



Scales not strongly hyaline-margined; sheaths normally more or less cross-rugulose; perigynia straw- 

 colored, yellowish or tawny at maturity, sharp-margined to base. 

 Perigynia 3.5-4.5 mm. long, the beak much shorter than the body; pistillate scales (except low- 

 est) acute or cuspidate. 

 Scales brownish-tinged; perigynia ascending at maturity, stramineous or brownish-tinged, 



the ventral face low convex, strongly nerved, more or less abruptly beaked 



14. C. densa. 



Scales reddish-brown tinged; perigynia spreading at maturity, reddish tinged, the ventral 



face flat, nerveless or nearly so, less abruptly beaked 15. C. vicaria. 



Perigynia 2.25-3.25 mm. long, the beak about length of the body; pistillate scales strongly awned 

 16. C. Dudleyi. 



8. Paniculatse. 



Leaf-blades 1.25 mm. wide; head little interrupted; perigynia 2-2.75 mm. long, shining, not concealed 



by the scales 17. C. diandra. 



Leaf-blades 2.5-6 mm. wide; head interrupted, compound; perigynia 3-4 mm. long, dull, concealed by 

 the scales 18. C. Cusickii. 



9. Stenorhynchae. 



Perigynia 3-4 mm. long, the beak much shorter than the body; scales strongly dark-tinged. 



Leaves clustered at base; sheaths not cross-rugulose ventrally; culms slender 19. C. Jonesii. 



Leaves not clustered at base; sheaths cross-rugulose ventrally; culms stout 20. C. nervina. 



Perigynia 4-6 mm. long, the beak longer than the body; scales not dark-tinged 21. C. stipata. 



10. Stellulatae. 



Spikes more or less widely separate, not brownish-black. 



Body of perigynium broadest near middle; beak with few weak serrulations 22. C. Iceviculmis. 



Body of perigynium broadest near base; beak strongly serrulate. 



Beak of perigynium bluntly bidentate, \i- x /i length of body, the ventral suture obsolete or 



inconspicuous; scale obtuse, M length of body of perigynium 23. C. interior. 



Beak of perigynium sharply bidentate, the ventral suture conspicuous. 



Beak of perigynium chestnut-brown tipped; culms obtusely triangular; pistillate scales 

 obtuse or obtusish, chestnut-brown tinged with broad shining margins and 

 apex, rounded and not keeled, the midvein obscure at apex. 



Spikes widely separate, the terminal long-clavate; perigynia 3.5-4 mm. long 



24. C. ormantha. 



Spikes approximate, the terminal short-clavate; perigynia 3.75-4.5 mm. long 



25. C. phyllomanica. 



Beak of perigynium reddish-brown tipped; culms sharply triangular; pistillate scales 

 obtusish to cuspidate, yellowish-brown tinged, the margins and apex narrow, 

 opaque or dull whitish, keeled with the sharp midvein which is prominent to 



apex 26. C. angustior. 



Spikes in a small (6-10 mm. long), densely capitate, brownish-black head 27. C. illota. 



11. Deweyanse. 



Perigynia shallowly bidentate, 3.5-4 mm. long, the beak about \4. length of body 28. C. leptopoda. 



Perigynia deeply bidentate, 4-4.5 mm. long, the beak about Yt length of body 29. C. Bolanderi. 



12. Ovales. 



Sheaths green-striate opposite blades, except at mouth 30. C. feta. 



Sheaths white hyaline opposite blades. 



Sheaths strongly prolonged upward at mouth opposite blade in a very membranaceous appendage; 



perigynia and scales greenish 31. C. fracta. 



Upper sheaths (at least) concave or truncate at mouth opposite blades. 

 Beak of perigynium flat and serrulate to strongly bidentate tip. 

 Perigynia 3.5-5 mm. long, 2-3 mm. wide. 



Perigynia thin with margins conspicuously wrinkled dorsally; culms 1-4 dm. high; 



spikes ovoid, densely capitate 32. C. straminiformis. 



Perigynia thick with margins not wrinkled dorsally; culms 3-9 dm. high; spikes 



oblong in an oblong bead 33. C. multicostata. 



Perigynia 3-3.5 mm. long, 1-1.5 mm. wide 34. C. subfusca. 



