Carexl a, pislillate flower ; h, staminate flower. a, split sheath of a grass; b, ligule; 

 p. 152. c, node of the culm ; </, part of leaf. 



Spilcelet of a grass i^Avena). gl, outer glumes ; J>e, outer palea or flowering glume ; 

 pi, inner palea ; /J, neuter or sterile floret; s, lodicules ; st, stamens; st^; stigma. 

 p. 160. 



[Opposite p. 160. 



