470 Key to the System of 



Fruit almost smooth. 



Rather tall and firm ; stems somewhat angular ; basal leaves 

 few, quite short ; one or two of the floral leaves some- 

 times rather elongated ; spikelets in a simple or somewhat 

 compound cymous umbel, ovate-ellipsoid, exceptionally 

 reduced to two or one ; stamens three ; floral bracts 

 brown ; style ciliolated ; stigmas two ; fruit biconvex. 



P. ferruginea. 



1994. Style fringed-ciliolate. 



Rather dwarf and lax ; stems thinly filiform ; basal leaves 

 many, short, very narrow, mostly beset with minute 

 hairlets ; floral leaves several ; spikelets in a compound 

 cymous umbel, ovate-ellipsoid ; floral bracts light-brown ; 

 stamen one only ; stigmas two ; fruit covered with the 

 reflexed hairlets of the styles. P, velata. 



Style nearly or quite glabrous. 



Rather dwarf and lax ; leaves many, short, very narrow, 

 mostly beset with minute hairlets ; floral leaves several ; 

 spikelets quite small, in a compound cymous umbel, ovate- 

 ellipsoid ; floral bracts light-brown ; stamens less often 

 two than one ; stigmas two ; fruit transparent, digonous, 

 smooth. P. aestivalis. 



X.IFOCARFHA. 



1995. Annual, dwarf. 



Leaves quite short, very narrow ; spikelets six or fewer, 

 generally globular ; floral bracts numerous, very narrow, 

 usually pale, pointed, soon fugacious ; rudimentary sepals 

 two, scale-like, colorless, narrow, connivent, to be re- 

 garded rather calycine than bracteal ; stigmas two ; fruit 

 linear-ellipsoid, compressed. L. inicrocephala. 



CAREX. 



1996. Stigmas two, fruit-coyer and fruit biangular ... 1997 



Stigmas three, fruit-cover and fruit triangular ... 2006 



1997. Spikelet constantly one only. 



Alpine, comparatively dwarf ; stems very thin ; leaves 

 narrow-linear; floral leaf undeveloped; spikelet from 

 globular to ellipsoid-ovate ; staminate flowers few, 

 terminal; pistillate flowers several; floral bracts almost 

 ovate, brown ; fruit-cover (perigynium) lanceolar-ovate, 

 short-pointed, greenish but black -brown at the summit; 

 fruit orbicular-ovate, brownish-yellow, shining. 



C. cephalotes. 



