Mr. Woods on the Genera of European Grasses. 57 



59. Eragrostis. Glumes and outer palea similar, membrano-scariose through- 

 out, with three prominent converging nerves. 



61. Glyceria. Glumes and outer palea membrano-herbaceous, with sharply 

 prominent nerves and a scariose margin. Florets subcylindrical, iin- 

 armed. 



60. Sclerochloa. Glumes and outer palese membranous, with rounded ribs, 

 often obscure, which disappear towards the base. Florets cylindrical 

 towards the base, keeled in some species at the tip, unarmed, or with a 

 minute and hardly distinguishable mucro. 



55. Catabrosa. Glumes and outer palea membranous at the base, both eroso- 

 truncate ; the latter with 3 ribs ending in as many teeth, which are united 

 by the scariose margin. 



62. Briza. Glumes nearly equal, broad, boat-shaped, obtuse. Outer palea 



navicular, heart-shaped, ventricose, keelless, unarmed. 

 54. Molinia. Glumes 2 — 3-flowered, with a subulate rudiment. Palese acute, 

 both entire, membranous, firmer than the glume, and hardening on the 

 seed. 



63. Cynosurus. Spiculse attached to a neutral spicula or spike. Fertile spi- 

 culse 1 or more flowered. Glumes scariose, keeled. Outer palea concave, 

 keeled, with a terminal seta. 



64. Dactylls. Glumes unequal, many-flowered, acute, herbaceous. Outer 

 palea herbaceous, with a terminal seta, compressed and keeled. Spiculse 

 crowded. Panicle one-sided. 



65. Festuca. Glumes unequal, many-flowered, thinner than the palea. Paleae 

 ribbed, rounded on the back, very acute, or with a terminal or very nearly 

 terminal seta. 



66. Bromus. Glumes unequal, many-flowered. Palea ribbed, with a dorsal 



seta. 



VOL. XVIII. 



