1 84 



CYPERACEAE 



30. 

 3i- 

 32- 



33 



29. VlRESCENTES. 



Perigynia densely pubescent. 



Leaves exceeding culms; lowest bract setaceous, 0.5 mm. 

 wide; pistillate spikes oblong-cylindric; perigynia 

 obovoid. 

 Culms exceeding leaves; lowest bract leaflet-like, O.5-3 

 mm. wide: pistillate spikes linear-cylindric; perigynia 

 elliptic. 

 Perigynia glabrous; at least at maturity. 



Perigynia much flattened, rounded at apex, lightly 



nerved. 

 Perigynia swollen, nearly orbicular in cross-section, 

 pointed at apex, coarsely nerved. 

 Perigynia 2 mm. long, brownish-green; scales not 



rough-cuspidate. 

 Perigynia longer, green; scales rough-cuspidate. 

 Pallescentes, represented onh b\ 

 Anomalae, represented only by 



LlMOSAE. 



Strongly stoloniferous; leaves involute, glaucous, 3 mm. 



wide or less; scales little exceeding peryginia. 

 Tufted; leaves flat, not glaucous, wider; scales much ex- 

 ceeding perigynia. 

 Scitae, represented only by 



34. Atratae, represented onh by 



35. RlGIDAE. 



Fertile culms aphyllopodii . 



Culms slender, very rough above; perigynium beak not 

 twisted; spikes erect (except abnormally). 

 Perigynia plano-convex, elliptic. 



Basal sheaths strongly filamentose. 

 Basal sheaths not filamentose. 

 Perigynia bi-convex, suborbicular. 

 Culms stout at base, smooth above; beak of perigynium 

 twisted when dry; lower spikes soon drooping. 

 Fertile culms phyllopodic. 



Lowest bract at most slightly exceeding inflorescem e; 



plants strongly stoloniferous. 

 Lowest bract much exceeding inflorescence; culms 

 densely cespitose, the stolons absent or incon- 

 spicuous. 

 Leaf-blades 1-3 mm. wide; staminate spike solitary; 



perigynia glaucous-green. 

 Leaf-blades wider; staminate spikes several; peri- 

 gynia stramineous green. 



36. Cryptocarpae. 



Sheaths rough hispid; lower pistillate scales tapering into 



awn. 

 Sheaths smooth; lower pistillate scales abruptly contracted 



into awn. 



104. C. Swanii. 



105. C. virescens. 



106. C. com planata. 



107. 

 108. 

 109. 

 1 10. 



C. caroliniana. 

 C. Bushii. 



C. pallescens. 

 C. scabrata. 



in. C. limosa. 



112. 



1 13- 



114. 



C. pun pen ula. 

 C. Barrattii. 

 C. Buxbaumii. 



"5- 

 121. 

 116. 



C. stricta. 

 C. Emoryi. 

 C. Haydeni. 



117. C. lorta. 



118. C. Goodenowii. 



119. 



123. 



C. lenticularis. 

 C. aqualilis. 



C. gynandra. 

 C. crinita. 



