COMPARATIVE ANALYSIS. 
4. Florets obseurely ribbed, panicle somewhat drooping 
Florets five-ribbed, panicle not drooping . 
5. Ligules lanceolate i : : 
Ligules short and truncate ; : : 
6. Culm and sheath smooth, root creeping . 
Culm and sheath rough, root fibrous : ; 
Lazra. 
Nemoralis. 
Pratensis. 
Trivialis. 
7. Ligules short and truncate, panicle somewhat drooping Vemoralis. 
Upper ligule oblong, acute, panicle not drooping . 8 
8. Stem spreading, procumbent at the base - . Annua. 
Stem nearly erect ; ; : : Alpina. 
TRIODIA. 
Ligule, a tuft of hairs : : : Decumbens. 
Briza. 
Glumes longer than the florets, ligule lanceolate . Minor. 
Glumes shorter than the florets, ligule very short ; Media. 
Dacrytis. 
Panicle secund . : . : , Glomerata. 
Cynosvrts. 
Spike ovate : : : F Echinatus. 
Spike linear : : “ : : Cristatus, 
Festuca. 
1. Glume one . : z - : Tniglumis. 
Glumes two ‘ : : ‘ Oe 
2. Leaves auricled : : : Bromus giganteus. 
Leaves not auricled : ; : 3 
3. Florets monandrous, shorter than their awns 4 
Florets triandrous, awnless, or as long as their awns 5 
4. Culm leafy in its upper part : : . Ayurus. 
Culm leafless above . : : : Bromoides. 
5. Raceme spiked s é ; Loliacea. 
Panicle branched . : : : : 6 
6. Lower leaves setaceous or involute, pedicels naked . 7 
Leaves linear, pedicels tufts of hair at end =. 3) GEO 
7. Culm square, not a foot high . : ; 8 
Culm round > ; ; : : 9 
8. Florets awned or pointed, edge of inner valve glabrous Ovina. 
Florets awnless, edge of inner valve downy . 
9. Root fibrous ; f ‘ : 
Root creeping . . - : 
Spikelets not more than five-flowered : : 
Spikelets more than five-flowered . F 
10. 
Vivipara. 
Duriuscula. 
. Rubra. 
Calamaria. 
. ll 
