﻿ANALYTICAL ARRANGEMENT 



Genera. 

 10. 



Species. Plate_ 



I Rachis and branches rough Poa ccesia. 40 



1 Rachis and branches smooth Poa annua. 40 



11. 



Rachis and branches rough to the touch Poa 



Rachis and branches smooth to the touch Poa maritima. 



41 



42 



12. 



13. 



Glumes with a prominent lateral rib on each 



side Poa procumbens. 



Glumes without lateral ribs 13. 



Lower half of the central rib of outer palea, 



smooth : 14. 



Central rib of outer palea rough the whole length. 15. 



42 



14. 



15. 



(Summit of the upper glume reaching to the base 

 of the third floret Poa rigida. 



Summit of the upper glume reaching to the base 



I Sum 

 I of 



the fourth floret Poa loliacea. 



[ Outer palea three- ribbed Poa sylvatica. 



( Outer palea seven-ribbed 16. 



4 3 

 43 



44 



16. 



BUCETUM. 



( Panicle compound. Spikelets not exceeding a 



quarter of an inch in length Poa aquatica. 44 



i Panicle simple. Spikelets usually an inch in 



I length Poafluitans. 45 



( Inflorescence racemed, approaching to a sj>ike.Bucetum loliaceum 45 



( Inflorescence panicled 1. 



Panicle simple Bucetum 



Panicle compound 2. 



46 



( Awn considerably shorter than the palea Bucetum elatius. 46 



I Awn much longer than the palea Bucetum giganteum. 47 



Bromus. 



\ Large glume seven-ribbed 1. 



( Large glume three-ribbed 4. 



f Summit of the upper glume midway between its 



base and summit of the third floret 2. 



Summit of the upper glume midway between its 

 (. base and summit of the second floret 3. 



Florets and glumes hairy Bromus mollis. 48 



Florets and glumes not hairy .Bromus racemosus. 48 



