COMPARATIVE ANALYSIS. 



231 



POLYPOGOX. 



Awns as long as the calyx, root creeping 

 Awns much longer than the calyx, root fibrous 



Littoralis. 

 Monspeliensis. 



CALAMAGEOSTIS. 



1. Corolla with a terminal awn, panicle loose . Lanceolata. 

 Corolla with a dorsal or basal awn, panicle close . 2 



2. Flowers without a rudiment of a second floret . Epigcjos. 

 Flower with a minute pedicel, bearing a tuft of hair 



(a rudiment of a second floret) . . .3 



3. Hairs as long as the corolla, awn near the base . Lapponica. 

 Hairs shorter than the corolla, awn above the middle . Stricta. 



AGEOSTIS. 



1. Inner valve of corolla wanting, or minute 

 Inner valve of corolla not minute 



2. Leaves linear, awn dorsal . 

 Leaves setaceous, awn basal 



2 

 3 



Canina. 

 Setacea. 



3. Awn very long and terminal, florets with a barren pedicel 



at base ..... Spica-venti. 

 Awn none, or short and dorsal, no barren pedicel . 4 



4. Ligule short and truncate, outer valve of corolla three-nerved Vulgaris. 

 Ligule oblong, outer valve of corolla five-nerved . Alba. 



CATABEOSA. 



"Branches whorled 



AIEOCHLOA. 

 Glumes shorter than the florets 



. Aquatica. 

 . Cristata. 



AlEA. 



1. Awn clavate 



Awn not clavate .... 2 



2. Leaves linear, awns not or but little longer than corolla 3 

 Leaves setaceous, awns longer than corolla . 4 



3. Awn basal, branches rough . . Cccspitosa. 

 Awn dorsal, branches smooth . . . Alpina. 



4. Florets hairy at base .... Flexuosa. 

 Florets scarcely hairy at base ... 5 



5. Panicle close, awn basal .... Prtecox. 

 Panicle spreading, awn dorsal . . . Caryophyttea. 



MELICA. 



1. Panicle drooping, florets not longer than the calyx . 2 



Panicle erect, florets much longer than the calyx . 3 



2.- Spikelets with two perfect florets . . . Nutans. 



