524 
CVII. GRAMINEyE. 
9. Milium. Panicle spreading. Glumes flattish on Ihe back. Glu-i 
mellas glabrous, aivnless, ultimately hardened on the caryopsis. 
11. Stipa. Panicle erect. Glumellas cartilaginous, outer one involute, 
ending in a very long twisted awn. 
13. Calamagrostis. Panicle loose. Floret surrounded with long silky 
hairs. Glumellas membranous. 
14. Agrostis. Panicle loose. Floret glabrous, or with a small tuft of 1 
hairs at the base. Glumellas membranous. 
§§ Glumes shorter than the floret, unequal. 
17. Molinia. Panicle somewhat contracted. Glumes acute, lower one ) 
1-nerved. Glumellas ultimately cartilaginous. 
18. Meltca. Panicle lax. Glumes broad, several-nerved. Glumellas 
ultimately cartilaginous. 
15. Catabrosa. Panicle spreading. Glumes obtuse, lower one 1-nerved. 
Glumellas membranous. 
** Spikelets 2 — 3-flowered ; perfect florets 2, or solitary with 1 — 2 barren 
(' di - or triandrous ) florets or a neuter floret as large as the perfect one. 
f Spikelets compressed laterally or somewhat terete. 
J Panicle lax, spreading or contracted. 
§ Fertile florets 2. Barren ones none. 
15. Catabrosa. Spikelets scarcely compressed, awnless. Glumes ob- 
tuse shorter than the florets. Glumellas truncate and erose at the 
end, glabrous on the keel and at the base. 
26. Poa. Spikelets compressed, awnless. Glumes shorter than the 
florets. Glumellas herbaceous, entire ; outer one keeled and hairy 
on the keel below the middle, scariose and bluntish at the end 
(not acuminate). 
31. Festuca. Spikelets compressed, awnless. Glumes narrow and acute, 
shorter than the florets. Glumellas herbaceous ; outer one convex 
on the back below, acuminate, not silky on the ribs. 
16. Aira. Spikelets compressed. Glumellas hairy at the base ; outer 
one awned at the back, toothed or entire or bifid, but not seti- 
gerous, at the end. 
33. Avena. Spikelets compressed. Glumellas hairy at the base, ulti- 
mately cartilaginous and firmly inclosing the caryopsis ; outer one 
with a long twisted awn, with 2 points or bristles at the summit. 
18. Melica. Spikelets convex on the back, awnless. Glumes as long 
as the florets nearly equal. Outer glumella convex on the back, 
entire, glabrous, ultimately cartilaginous. Neuter floret club- 
shaped. 
17. Molinia. Spikelets awnless. Glumes acute, much shorter than 
the florets, unequal. Outer glumella convex on the back, entire, 
glabrous, ultimately cartilaginous. Neuter floret subulate. 
27. Triodia. Spikelets compressed, convex on the back, awnless. 
Glumes as long as the florets. Glumellas hairy at the base ; outer 
one 3-toothed at the end. 
§§ Spikelets with one perfect and 1 — 2 barren florets. 
19. Holcus. Florets 2, triandrous ; lower perfect ; upper barren, awned. 
20. Arrhenatherum. Florets 2, triandrous ; upper perfect, with a 
short bristle at the point ; lower barren ; with a long twisted 
awn. 
