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PUBLIC HEALTH BULLETIN NO. 286 



7. Achene bearing a tubercle (formed by the swollen per- 8. 



sistent style base) . 

 7. Achene not bearing a tubercle 9. 



8. Spikelets with more than 2 scales enclosing 8. Psilocarya, p. 94. 



achenes; no perianth-bristles present (fig. 6) . 

 8. Spikelets with only 1 or 2 scales enclosing 9. Rhynchospora, p. 94. 



achenes; perianth-bristles usually present 



(fig. 7). 



Figure 6 



Figure 7 



9. Spikelets with the uppermost scale only enclosing an 10. Cladium, p. 98. 

 achene; our commonest species has saw-edged, cut- 

 ting leaves (fig. 8). 

 9. Spikelets with the upper several scales bearing achenes ; 1 0. 

 leaves not armed. 



10. Each scale of spikelet bearing a bristle or awn 6. Fuirena, p. 93. 



near the apex (fig. 9). 

 10. Each scale of spikelet not bearing a bristle or 11. 

 awn. 



Figure 8 



Figure 9 



