VASCULAR PLANTS. 135 



Upper flower £ , with 2 navicular palets with- 

 out aristae; lower palet wrapped rouud the up- 

 per. Stamens 2. Lower 2 flowers, neutral 

 with 1, aristate, canaliculate palet. 



%. leaves flattened; panicle contracted. 



8. PolypogOIl, Desf. 



Spikelets 1-flowered. Glumes 2, carinate, 

 aristate, much longer than the flower. Palets 

 2; upper 2-carinate, lower truncate at the apex. 



. leaves flattened. 



9- Agrostis, L- 



Spikelets 1-flowered. Glumes 2, carinate, 

 awnless, larger than the flowers. Palets 2: 

 lower sometimes aristate; upper 2-carinate, 

 sometimes wanting. 



0. 2£. tufted; leaves sometimes involute; 

 panicles generally diffuse with verticillate 

 branches. 



10. Gastridium, Pal. 



Spikelets 1-flowered. Glumes 2, ventricose 

 at the base, much larger than the flower and 

 closed. Palets 2; the inferior sometimes aris- 

 tate, embracing the superior, 2-carinate one. 



0. leaves flattened; panicles contracted, 

 spike-like. 



11. Deyeuxia, Clar. (Calamagrostis.) 



Spikelets 1-flowered; flowers sessile with a 



