Fig. 222: Cy perns difformis: a, flower without scale, X 40; b, group of spikelets, 

 X 8; c, ray of inflorescence, showing globose head of spikeiels and part of scabrellate 

 margin of involucral leaf, X 2; d, trigonous achene, showing the minutely cellular sur- 

 face, X 2H; e, culm (cross section), X 6; f, scale, X 40; g, habit, showing the umbellate 

 inflorescences with involucral leaves of unequal length, X Va- (From Mason, Fig. 130). 



