Fig. 184: Scirpus acutus: a, mature achene, the subtending bristles with conspicuous 

 retrorse barbs, X 8; b, spikelet, X 4; c, flower without the scale, X 12; d, carinate scale, 

 showing the short awn and the cleft ciliate apex, X 8; e, achene (cross section), X 8; 

 f, habit, showing stout rhizome, basal sheaths and erect culms, X Vr,; g and h, inflores- 

 cences, showing variation, X -'-,. (From Mason, Fig. 157). 



