(12) 



2. Agrostis. — Glumae acute, the inferior 

 one larger. Palete membranaceous. 



3. Calamagrostis. — Glumci? acute, the in- 

 ferior one larger. Paleae surrounded by 

 silky hair at the base. 



4. Stipa. — Glumse acute, sometimes aris- 

 tate. Palea3 cartilaginous, the inferior 

 one cylindrically involute. Awn strong, 

 articulate at the base, persistent, de- 

 veloped from the apex of the palea. 



5. Gastridium. — GlumiB acute, very much 

 compressed, ventricose at their base. 

 Paleas membranaceous. 



d. SpiJcelets pedicillatey 2- oo -flowered, the 

 uppermost floret frequently rudimentary . 



aa. Stigma aspergilliform, exserted heloiv the 

 apex of the floret. 



1. Phragmites. — S pikelets Go-flowered, 

 lowermost floret $> or neuter, the other 

 florets ^ and pilose. 



2. Hierochloa. — Spikelets 3-flowered, the 

 two inferior ones c5 and triandrous, the 

 terminal one ^ and diandrous. 



bb. Stigma plumose, exserted near the base of 

 the floret. 



1. Arrhenatherum. — Spikelets 2-flowered; 

 inferior floret 6 , aristate ; superior 

 floret , awnless. 



