- 
y | LUXXXIX. GRAMINE/®. 505 
of food for man, in the shape of grain, and for cattle as constituting the 
chief portion of meadows and pastures. 
Spikelets 1-flowered 2 
Spikelets containing 2 or more flowers — : 24 
Spikelets arranged along one side of a slender, simple, linear spike 3 
9 Spikelets arranged along one side of the simple, linear branches of the panicle 5 
le cice: arranged i in a Close, cylindrical or ovate spike or 4 ie like Ai Ae 
Spikelets arranged in a loose, branching panicle : ; 16 
Spikelets 1-flowered, in one-sided linear spikes. 
Glume 1 only, ending in a fine point, and enclosing the palea and flower. 
24, NARDUS. 
Two outer empty glumes and a flowering one : : ; Paar 
‘ Outer glumes 1 line long, thin, and obtuse. Axis not jointed Z 10. MIBORA. 
4 Outer glumes 2 lines long, stiff, and strongly ribbed. Axis jointed. 
23. LEPTURUS. 
Spikelets in pairs or clusters along the branches : P ; 3. PANICUM. 
Spikelets single along the branches 
( Spikelets half an inch long, laterally flattened. "Glumes all strongly keeled, 
6 erect : pei SPARTINA. 
Spikelets about a line long. ‘Outer elumes spreading : 4 21. CYNODON. 
Spikelets 1-flowered, in a dense spike or spike-like panicle. 
” Outer glumes without awns. Flowering glumes with or without awns 8 
All the glumes awned ~ . : : 2 Ako 
Only 2 nearly equal empty g elumes ‘enclosing the flower ‘ ; ee, 
An additional small empty ‘olume outside the 2 equal ones é "3. PANICUM. 
84 ‘Two additional small, awned, empty glumes, withinside the two equal ones. 
5. ANTHOXANTHUM. 
Outer glumes swollen and shining at the base. Spikelets rather small. 
14, GASTRIDIUM. 
Outer glumes keeled or boat-shaped . : . 10 
A tuft of hairs at the base of fhe flower, within the outer elume. “Reed-like 
10« grass with a very long spike ‘ ; 15. PSAMMA. 
( No tuft of hairs outside the flower within the outer elumes. Spikelets flat . 11 
Flowering glume with a fine awn on its back (sometimes shorter than the 
uf outer glume). No inner palea é : : : p . 9. ALOPECURUS. 
Flowering glumes without awns. Inner palea present . ; 12 
12 f Keel of the outer glumes expanded into a flat wing . é . 6. PHALARIS. 
\ Keel of.the outer glumes not winged . 8. PHLEUM. 
Spikelets 3 together on each tooth of the simple, close, “cylindrical spikes, 
13 1 or 2 of each cluster reduced to a pair of empty olumes . . 26. HORDEUM. 
pane ee small and numerous, in a close spike-like panicle, all containing 
flowers . : : : ; 2 : : . : : 
14 { Flowering elumes without awns ‘ ; ‘ : . 8. PHLEUM. 
Flowering glumes awned as well as the outer ones. : ’ 15 
15 {§ Spike ovate, with long softly silky hairs : . ‘ : ; 11. LAGURUS. 
Spike cylindrical or branched, not hairy . : . 12. POLYPOGON. 
Spikelets 1-flowered, in a eee Bip hae 
16 f Spikelets ovate, obtuse or scarcely acute . § : : : 2 ; Bg 
\ Spikelets lanceolate, pointed , : 19 
Spikelets very flat, consisting of only 2 ‘elumes, both keeled. | 1. LEERSTA. 
17 | Sikelet scarcely ‘flattened. Two outer empty glumes about the size of the 
flowering one : Pee ks: 
Spikelets rather large, containing within the outer olumes, besides the flower, 
18 a small, wedge- shaped, terminal glume or rudimentary flower 38. MELICA. 
Spikelets’ small, containing nothing besides the flower within the outer 
glumes . . 2. MYLIUM. 
Small tufts of hairs or hairy appendages at the base of the flower within the 
outer glumes : + a 
{ No hairs or hairy appendage at the base of the flower within the outer olumes 21 
Noawns. A small hairy appendage at the base of the flower on each side. 
90- 7. DIGRAPHIS. 
Flowering glume with a short fine awn. A tuft of hairs at the base of the 
flowers ; : : ; ; : : : 16. CALAMAGROSTIS. 
