Mr. Woods on the Genera of European Grasses. 55 



27. Vilfa. Glumes membranous, unequal, not exceeding the paleae. Palese 



membranous, unarmed. 

 26. Agrostis. Glumes membranous, including. Palese unequal, smooth, not 



hardening upon the seed. Awn, if any, fine, dorsal. 



29. Knappia. Paleee scariose, shaggy, truncate, the inner minute or wanting. 

 Spiculse in a raceme, obscurely 2-rowed. Rachis cylindrical. 



24. Polypogon. Glume furnished with a long slender seta! scariose, inclu- 

 ding. Paleae scariose ; the outer with a dorsal awn. 



25. Milium. Glumes herbaceo-scariose. Palese membrano-coriaceous, nearly 

 equal, unarmed, hardening on the seed. 



30. Piptatherum. Glumes membranous. Floret sessile. Palese subcoriaceous, 

 joined to a straight terminal awn, hardening on the seed. 



31. Stipa. Glumes scariose, herbaceous fit the base. Floret stalked. Palese 



coriaceous, hardening on the seed, a geniculate and twisted dorsal awn 

 joined to its extremity. 



32. Achnatherum. Glumes scariose, herbaceous at the base. Palese mem- 

 branous. Awn geniculate and twisted, with a distinct though slightly 

 marked joining on to the outer palea, at which it readily breaks off. 



L. Spiculse in a loose panicle, with a second imperfect floret. 



49. Holcus. Lower floret perfect, unarmed. Upper generally barren, awned. 

 48. Arrhenatherum. Lower floret barren, with a geniculate awn ; upper per 



feet, with a short straight awn. 

 16. Hierochloe. Two outer florets barren; middle perfect, diandrous, all 



unarmed. 



Melica unijlora. 



M. Spiculse scattered, with more than one perfect floret. 



N.B. In these genera, Aira, Deschampsia, Danthonia, and Avena are mostly 

 awned, the awn easily breaking away from the palea. They are never fur- 

 nished with a seta forming a mere continuation of the midrib. In Trisetum 

 and Kosleria it is rather difficult to decide whetlier we find an awn or a seta. 

 In the first of these genera it has more the character of the first ; in the second, 

 of the latter. Dactylis, Bromus, and Cynosurus are setigerous ; Festuca is often 



