234 COMPARATIVE ANALYSIS. 
11. Panicle much branched, root creeping : 3 LElatior. 
Panicle not much branched, root fibrous oe Pratensis. 
Bromvs. 
1. Stamens two : . : : Diandrus. 
Stamens three . ; ; : ae 
2. Leaves auricled, glabrous : - : Giganteus. 
Leaves not auricled, mostly pubescent : . ae 
3. Awn much longer than florets . : - 4 
Awn not much longer than florets . ae 
4. Panicle erect in flower, awn twice as long as fis florets Maximus. 
Panicle drooping, awn not twice as long as the florets Sterilis. 
5. Florets pubescent : . : : 6 
Florets glabrous . : : 8 
6. Florets about eight, remote, and ie than the awn Asper. 
Florets nine or more, crowded, as long as the awn - 7 
7. Leaves slightly hairy, panicle spreading . : Velutinus. 
Leaves very pubescent, panicle erect, close ; . Mollis. 
8. Panicle drooping in fruit ; : 3 9 
Panicle erect : : ; ; 11 
9. Spikelets lanceolate, awns Soran ‘ : Arvensis. 
Spikelets ovate, awns not straight . ; eer 
10. Awns remarkably spreading, leaves pubescent . Squarrosum. 
Awns not spreading, leaves slightly hairy : Secalinus. 
11. Root leaves much narrower than the cauline : Erectus. 
Root leaves not narrower than the cauline F ~ Racemosus- 
AVENA. 
1. Spikelets drooping, florets not longer than the calyx 2 
Spikelets erect, florets mostly longer than the calyx vy aS 
2. Florets terminated by two bristles : ‘ Strigosa. 
Florets not terminated by two bristles : . Katua. 
5. Glumes very unequal . ; . é Flavescens. 
Glumes nearly equal : ‘ bi. ati 
4. Leaves downy, spikelets two or fies! flowered . Pubescens. 
Leaves not downy, spikelets more than three-flowered 5 
5. Lower leaves involute : : : Pratensis. 
Leaves flat : : : 6 
6. Sheaths flat, lower part of pelea two- Pe . LPlaniculmis. 
Sheaths round, culm round 3 : . Alpina. 
ARUNDO. 
Florets purplish, culm five feet high : : Phragmites. 
Exymvs. 
1. Leaves flat, florets awned ‘ : . Europeus. 
