﻿OF THE SPECIES. XlX 



Otnera. Species. PlrOe. 



Florets with two long bristles at the summit... Avena str if/am. 26 



' Florets without bristles at the summit A vena fatun. 27 



Sesleria. Sesleria ccerulea. 27 



{Outer palea terminating in a short awn not half 



the length of the palea Cynoswm cristatvs. 28 

 Outer palea terminating in a long awn as long 



as the palea Cynoswus echinatus. 28 



Dactylis Dactylis glomerata 29 



Arundo Artundo phragmites. 29 



Triodia Triodia decv/mbens. 30 



Briza Briza media. 30 



Hierochloe Hierochloe borealis. 31 



Poa. 



Florets webbed 1. 



Florets not webbed 4. 



i Upper leaf much longer than the sheath 2. 



\ Upper leaf about as long or longer than the sheath.3. 



j Ligule of upper sheath short and rounded Poa pratensis. 31 



I Ligule of upper sheath long and pointed Poa trivialis. 35 



/ Ligule scarcely perceptible. Outer palea 5-ribbed.Poa nemoralis. 3 6 



| Ligule prominent. Outer palea three-ribbed... Poa compressa. 37 



Florets hairy at the base 5. 



Florets not hairy 12. 



t Outer palea three-ribbed 6. 



( Outer palea five-ribbed 7. 



Panicle erect. Upper leaf linear, folded Poa alpina. 37 



Panicle drooping. Upper leaf lanceolate, flat.. Poa laxa. 38 



I Upper jointsituated above the centre of the stem.8. 

 ( Upper joint situated below the centre of the stem.9. 



Second sheath not reaching to the first joint.. ..Poa Polynoda. 39 



Second sheath extending beyond the first joint.Poa montana. 39 



f Small glume reaching beyond the base of the 



I third floret 10. 



I Small glume not reaching beyond the base of 

 (the second floret.... 11. 



