evil. GRAMINE7E. 
527 
3G. IIordeum. Spikelets tevnate, 1 — 2 usually neuter or barren ; fertile 
ones with one perfect floret and a rudimentary neuter one. Glumes 
collateral, awned. 
37. Triticum. Spike simple. Spikelets solitary, sessile, transverse to 
the rachis, many-flowered. Glumes opposite, nearly equal ; outer 
one with several nerves. Inner glumella minutely ciliate on the 
nerves. 
26. Poa. Spike simple or compound, somewhat unilateral. Spikelets 
approximate, without a pectinate bractea at the base, several- 
flowered. Glumes opposite ; outer one 1-nerved. 
30. Cynosures. Spikelets approximate, with a pectinate bractea at the 
base, shortly stalked, with 2 — 5 perfect florets. Glumes equal, 
1 -nerved. 
38. Brachypodium. Spike simple. Spikelets solitary,’ sessile, trans- 
verse to the rachis, remote, many-flowered. Glumes opposite, 
unequal; outer one with several nerves, much shorter than the 
contiguous lowermost floret. Inner glumella strongly ciliate on 
the nerves. 
31. Festuca. Spikelets distant, solitary or in pairs, placed edgewise to 
the rachis, with 6 — 10 fertile florets, awnless. Glumes opposite, 
very unequal, much shorter than the lowermost contiguous floret, 
outer one the smallest, sometimes minute. 
39. Louum. Spike compressed, simple, or sometimes slightly compound. 
Spikelets solitary, approximate, sessile, placed edgewise to the 
rachis, with 3 or more perfect florets. Glumes solitary, or 2 
opposite ; one next the rachis small ; outer with several nerves, as 
long as or longer than the lowest contiguous floret. 
40. Lepturus. Spike simple, cylindrical. Spikelets solitary, imbedded 
in alternate cavities on opposite sides of the rachis. Glum'es 2, 
cartilaginous, collateral on the outside of the cavity and cover- 
ing it. 
** Spikelets ( with 1 perfect floret') unilateral, arranged on both sides 
of a simple rachis. Styles distinct, very short. Stigmas elongated, 
filiform. 
41. Knappia. Glumes nearly equal. Outer glumella toothed at the 
end. 
*** Spikelets ( with 1 perfect floret) arranged only on one side of the partial 
rachis, and forming a racemose or digitate compound spike or raceme. 
Styles elongated. 
42. Spartina. Partial spikes erect. Spikelets laterally compressed. 
Glumes very unequal. Glumellas acuminate. Styles united to 
near the middle. Stigmas elongated. 
43. Cynodon. Partial spikes spreading. Spikelets laterally compressed, 
with a rudimentary neuter floret. Glumes nearly equal. Outer 
glumella cvmbiform. Styles distinct. 
44. Digitaria. Partial spikes spreading, digitate. Spikelets without 
bristles at the base, dorsally compressed, awnless, with a neuter 
floret of one glumella in front as large as the perfect one. Glumes 
very unequal. 
24. Panicum. Partial spikes spreading, racemose. Spikelets with a few 
long bristles at the base, dorsally compressed, awned, with a neuter 
floret of two glumellas in front as large as the perfect one. Glumes 
very unequal. 
