THE GENUS CAREX IN CALIFORNIA 17 



30. Trachychlaenae. 



Represented by one species in our range 113. C. spissa. 



31. Hirtse. 



Beak of perigynium obliquely cut, shallowly bidentate at maturity; foliage pubescent; staminate 



scales long ciliate 114. C. yosemitana. 



Beak of perigynium deeply bidentate; staminate scales at most erose. 

 Foliage not pubescent; teeth of perigynium beak short. 



Lowest bract strongly sheathing; fertile culms phyllopodic with many leaves, the sheaths 



not breaking and becoming filamentose 115. C. oregonensis. 



Lowest bract not sheathing; fertile culms aphyllopodic with few leaves, the sheaths breaking 



and becoming filamentose 116. C. lanuginosa. 



Sheaths and under surface of leaf-blades hairy; teeth of perigynium beak conspicuous 



117. C. Sheldonii. 



32. Extensae. 



Represented by one species in our range 118. C. viridula. 



33. Physocarpae. 



Perigynia ascending; lower sheaths more or less strongly filamentose; culms sharply triangular. 



Perigynia 5-8 mm. long, abruptly contracted into beak 119. C. vesicaria. 



Perigynia 7-10 mm. long, tapering into beak 120. C. exsiccata. 



Perigynia spreading at maturity; lower sheaths not filamentose; culms bluntly triangular below spikes. 

 121. C. rostrata. 



34. Pseudo-Cyperese. 



Perigynia suborbicular in cross-section, more or less inflated; teeth of perigynium beak 0.5-1 mm. long. 



122. C. hystricina . 



Perigynia obtusely triangular, scarcely inflated, closely enveloping achene; teeth of perigynium beak 



1.5-2 mm. long, recurved or spreading * 123. C. comosa. 



