236 



COMPARATIVE ANALYSTS. 



Dr. Parnell gives the following analysis: — 



Alopectjhtjs. — Stem rough. .... Agrestis. 



Stem smooth . . . .1 



1. Upper leaf much shorter than its sheath . . 2 

 Upper leaf ahout equal in length to its sheath . 3 



2. Awn projecting more than half its length beyond floret Alpinus. 

 Awn projecting not more than a third beyond floret Pratemis. 



3. Awn projecting half its length beyond floret . Geaieulatus. 

 Awn not projecting beyond floret . . . Fulxus. 



Phletjm. — Glumes awned .... 1 



Glumes acute, not awned . . .2 



1. Awn not half the length of glume . . Praiense. 

 Awn more than half the length of glume . Alpinum. 



2. Floret not half length of calyx . . . Aremrium. 

 Floret more than half length of calyx . . Michelli. 



Phalaris. — Base of floret with two membranous valves Canariensis. 



Base of floret with two hairy valves . Arundinacea. 



Hoedeuji. — Glumes of middle spikelet fringed . . Murinum. 



Glumes of middle spikelet not fringed . . 1 



1 . Inner glume of lateral spikelet very much dilated on one side Maritinitm. 



Glumes not dilated .... Pratense. 



Ageostis. — Ligule of upper sheath very short . 

 Ligule of upper sheath long 

 1. Floret of two paleae, sheaths roughish 

 Floret of one palea, sheaths smooth . 



Calamagkostis. — Hairs shorter than floret 

 Hairs longer than floret . 

 Melica. — Calyx with one floret and rudiment of second 

 Calyx with two florets and rudiment of third 

 Molinia. — Outer palea five-ribbed 



Outer palea three-ribbed 

 Holcus. — Awn of floret smooth 

 Awn of floret rough . 

 Aira. — Awns not protruding beyond the florets 



Awns protruding considerably beyond the florets 



1. Awn arising from little above base of palea 



Awn arising from little above centre of outer palea 



2. Sheath of leaf rough from above downwards 

 Sheath of leaf rough from below upwards 



3. Panicle spreading 

 Panicle close 



Vulgaris. 

 1 



Alba. 

 Canina. 



Stricta. 



. Epigejos. 



Uniflora. 



. Nutans. 



Pepauperata. 



. Carulea. 



Lanatus. 

 Jloliis. 

 1 

 2 

 Casphosa. 

 . Alpina. 

 Flexuosa. 

 3 

 CaryopliiUea. 

 . Pracox. 



