236 COMPARATIVE ANALYSTS. 
Dr. Parnell gives the following analysis:— 
Atoprecurus.—Stem rough . : ; : Agrestis. 
Stem smooth ; : 1 
1. Upper leaf much shorter than its seat : 2 
Upper leaf about equal in length to its niente ; 3 
2. Awn projecting more than half its length beyond floret Alpinus. 
Awn projecting not more than a third beyond floret Pratensis. 
3. Awn projecting half its length beyond floret . Genculatus. 
Awn not projecting beyond floret . . . Fulvus. 
Puirum.—Glumes awned . : : k 1 
Glumes acute, not awned : : : 2 
1. Awn not half the length of glume ; : Pratense. 
Awn more than half the length of glume 5 Alpinum. 
2. Floret not half length of calyx . : .  Arenarium. 
Floret more than half length of calyx : . Micheli. 
PuHataris.—Base of floret with two membranous valves Canariensis. 
Base of floret with two hairy valves . Arundinacea. 
Horpeum.—Glumes of middle spikelet fringed ; Murinum. 
Glumes of middle spikelet not fringed mae te | 
1. Inner glume of lateral spikelet very much dilated on one side Maritinum. 
Glumes not dilated : j Pratense. 
Acrostis.—Ligule of upper sheath very short . : Vulgaris. 
Ligule of upper sheath long . : ; 1 
1. Floret of two palez, sheaths roughish i , Alba. 
Floret of one palea, sheaths smooth . : . Canina. 
CatamAcrostis.—Hairs shorter than floret : . Stricta. 
Hairs longer than floret : . Lprgejos. 
Metica.—Calyx with one floret and rudiment of second Uniflora. 
Calyx with two florets and rudiment of third . WVutans. 
« Motrnta.—Outer palea five-ribbed . : . Depauperata. 
Outer palea three-ribbed ; ; . Cerulea. 
Horcus.—Awn of floret smooth : : ’ Lanatus. 
Awn of floret rough e , . Mollis. 
Arra.—Awns not protruding beyond the fiorets : 1 
Awns protruding considerably beyond the florets : 2 
1. Awn arising from little above base of palea . Cespitosa. 
Awn arising from little above centre of outer palea . Alpina. 
2. Sheath of leaf rough from above downwards : Flexuosa. 
Sheath of leaf rough from below upwards : : 3 
8. Panicle spreading : P . . Caryophillea. 
Panicle close : ; : \ ~ . Precox. 
