Mr. Woods on the Genera of European Grasses. 55 



'27. Vilfa. Glumes membranous, unequal, not exceeding- the paleœ. Paleœ 



membranous, unarmed. 

 26. Jgrost'is. Glumes membranous, including. Palese unequal, smooth, not 



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

 '29. Knappla. Palea^ scariose, shaggy, truncate, the inner minute or wanting. 



Spiculœ in a raceme, obscurely 2-rowed. llachis cylindrical. 



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



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



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

 equal, unarmed, hardening on the seed. 



30. Pipfatheruin. Glumes membranous. Floret sessile. Paleae subcoriaceous, 

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



31. Stipa. Glumes scariose, herbaceous at the base. Floret stalked. Palete 

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

 joined to its extremity. 



32. Achnatherum. Glumes scariose, herbaceous at the base. Paleae 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. Spiculœ in a loose panicle, M'ith 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. 

 Melicu unifiora. 



M. Spiculœ 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 tlie palea. They are never fur- 

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

 and Kœleria it is rather difficult to decide whether 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 Ci/nosiirus are setigerous ; Festuca is often 



