XX vm 



* * * * Inflorescence paniculate. Panicle lax. 



Spihelets one-flmvered'. 



3. Leersia. — Spikelets without glumes. 



5. Phalarls armvUnacea. — Mower with one or two small hairy scales 



below the paleae. 

 9. Milium. — Spikelets flat, or dorsally compressed. Glumes 



nearly equal. 



13. Calamagi-ostis. — Spikelets laterally compressed. Flower sur- 



rounded by long hairs at the base. 



14. Agrostis. — Spikelets laterally compressed. Flower naked 



or slightly hairy at the base. Upper glume 

 smaller. A. canina has only a single palea to 

 the flower. 



15. Apera. — Like Agrostis, but with the lower glume smaller, 



and a long subterminal awn to the outer palea. 

 28. Melica uniflora. 



Spihelets two- or more- flowered. 



16. Catabrosa. — Glumes and palese broad, truncate, awnless. 



17. Aira. — Glumes acute. Paleae bifid ; the lower one 



with a dorsal, twisted awn. Very near Avena, 

 but with smaller two-flowered spikelets. 



18. Corynephorus. — Like Aira, but the awn is clavate or thickened 



at the upper part. 



19. Molinia. — Glumes acute, shorter than the flowers. Paleae 



entire, awnless. 



20. JMelica. — Glumes ei^ual to the flowers in length. Palese 



entire, awnless. A remarkable club-shaped 

 appendage below the flowers, and within the 

 glumes, represents a second or third flower. 



21. Holcus. — Spikelets two-flowered. Upper flower stameni- 



ferous only, awned ; lower one perfect, usually 

 awnless. 



