118 FLORAL CHARACTERS [CH. VII 



X Palea distirictly hifid at the apex: awn 

 nearly twice its length. A very small 

 grass about six inches high: leaves sub- 

 ulate, fine and short. 



A. caryophyllea, L. 



XX PalecE almost imperceptibly bidentate: 

 aum not much longer than palea. About 

 12 — IS inches high : leaves inrolled. 



A. fleccuosa, L. 



Other species of Aira, with more condensed inflorescences, are 

 dealt with on p. 112. Agrostis is distinguished by the leaves and 

 one-flowered spikelets (see p. 104). Poa and Catdbrosa have no 

 awns. 



