Pycreus.'] 



CLVI. CYPERACEiE (cLARKE). 



289 



p. nitens. 

 P. pumilus. 



19. P. Hildebrandtii. 



P. sulcinux. 

 P. pelophilus. 



Spikes umbellate, sometimes nearly in a head, 

 straw-coloured, yellowish or reddish, not 

 chestnut-brown nor black. Roots fibrous 

 (or rhizome less than i in. long). 

 Spikelets small, delicate ; glumes whitish, 

 very thin. — Annuals. 

 Spikelets ^ in. broad . . . ,12. 



Spikelets | in, broad . . . .13. 



Spikelets yellowish, ferruginous, or brown- 

 red ; glumes not scarious. 

 Nut symmetric. 



Spikelets ^ in. wide, not bright . . 14. P. polystachyot. 

 Spikelets ^ in. wide, bright ferruginous . 18. P.ferrut/ineut. 

 Spikelets 7?q~\ in. wide, bright brown- 

 red 



Nut one-sided, the part next the rhachilla 

 flattened. Spikelets yellowish. 

 Spikelets ^ in. wide . . , .16. 



Spikelets ^ in. wide . . . .17. 



Spikes in 1 head (or in a very close umbel), 

 white, straw-coloured or yellowish. 

 Head 1, more or less yellow. 



Stem and leaves rather slender ; spikelets 

 1^ in. wide ..... 



Stem and leaves capillary ; spikelets ^ in. 

 wide ...... 



Umbel very close ; heads white. 

 Stems bulbous at the base 

 Stems not thickened at the base, decum- 

 bent ..... 



Spikes in a simple umbel (or in 1 head), chest- 

 nut, black or dusky brown. 

 Stolons 0. No woody rhizome. 



Plants very slender ; stems less than 6 in. 

 high. 

 Spikelets -^ in. broad . . , , 



Spikelets J^ in. broad . . . , 

 Plants medium-sized. Stems 6-28 in. high. 

 Glumes not overlapping in fruit, black- 

 chestnut with green keel . . 27. P. elegantulus 

 Glumes closely overlapping in fruit. 

 Spikelets lanceolate, i.e., sides not 



parallel 15. P. JEthiops. 



Spikelets linear-oblong, sides parallel . 20. P. glubosus. 

 Rhizome woody or stolons present. 



Head 1 only 29. P. ntfa^enHs. 



An umbel, or distinctly compound head. 

 Spikes chestnut to black or a rich brown. 



Spikelets moderately compressed . 28. P. umbrosus. 

 Spikelets strongly flattened . .31. P. betschnanut. 



Spikes a smoky yellow-red . . . 30. P. spissijionis. 



Umbels compound, or subsimple, large. Spike- 

 lets yellow, straw-coloured or pale brown. 

 Umbel subsimple. Margins of glumes crisped 



wavy 32. P. angulattu. 



21. 



22. 



. 23. 



24. 



25. 

 26. 



P. propinquus. 

 P. capiUifoliut. 

 P. smilhianus. 

 P. cuanzen^is. 



P. minimus. 

 P. melas. 



