Graminaceae 1 7 



3rd and 4th glumes empty, small with dorsal awns. 



Anthoxanthum. 



3rd and 4th glumes, or at any rate the 3rd with a 

 triandrous ^ flower, almost as long as the ist and 2nd. 

 Upper flowers hermaphrodite, diandrous. Hierochloe. 



Tribe 4. Agrostideae. Spikelets i -flowered with 

 two empty glumes. Palea 2-nerved. 



* Rachilla not produced beyond flowering glume. 



Panicle effuse, fruit included in hardened glume. 



Milium. 



Panicle dense, cylindric, spikelets falling as a whole, 

 flowering glume with dorsal, bent awn. Alopecurus. 



Panicle dense, cylindric, empty glumes persistent, 

 flowering glume awnless. Phleum. 



Spikelets dorsally compressed in a simple spike. 



Mibora. 



Panicle loose, flowering glume small, membranous. 



Agrostis. 



Panicle contracted, spikelets falling as a whole, 

 empty glumes with awns. Polypogon. 



Rachilla with long silky hairs, empty glumes acu- 

 minate. Calamagrostis. 



** Rachilla produced beyond the flowering glume. 



Empty glumes large, dilated at base, much larger than 

 the minute 4-toothed flowering glume. Gastridium. 



Empty glumes large, flowering glumes bifid, with 

 slender awns. Apera. 



Empty glumes large, flowering glumes with awns, 

 rachilla ciliate. Deyeuxia. 



Spikelets large in dense panicle, rachilla long and 

 silky. Ammophila. 



Empty glumes with feathery hairs, flowering glume 

 3-awned. Lagurus. 



