307 
GRAMINEAE, 
Key to genera. 
(In this and subsequent keys glume t is the outer one, glume r1 the 
on.) 
e 
Nm 
» 
» 
ex 
5 
P 
10, 
iL 
12. 
next and so 
. Spikelet with 1 fertile flower with or 
without a second male one below it 
Spikele "ih 2 or more napa ey 
s or the upper unis 
Bpikélets or spikes more or Jis pedi- 
cellate in an z^ d ene or 
spike-like panicle 
ieri sessile or in pairs, one sessile 
one pedicellate, or subsessile, in a 
spike or on the spike-like pone 
of inflorescence... eve . 
Spikelets not in distinct rows, but 
ing a dense cylindrical Mes or 
p e panicle ... P ane 
pikali singly sessile or in ` pairs, i 
or 4 rows, in a simple sieually 
. Spikelets "asc awn on hack ok glume... 
Spikelets not flat, awn terminal Fes 
A wns of spikelet 2-3 ... ve t 
Awns of spikelet 1 — ... 
Axis of spikelet produced and poni- 
cillate with long cere fee hai 
Axis not produced ose 
. Racemes simple; awns much pis 
than glumes 
Panicle branched but dense spike-ike ; : 
awns very short  ... wee 
Spikelets surrounded by bristles or hairs 
Spikelets naked oe 
Spikelets surrounded bk buses S 
Spikelets surrounded by silky hairs ... 
Spikelets in spike-like panicle wie 
Spikelets in spikes or racemes zm 
29. Pogonatherum (p. 
320). 
8, 
52. Deyeuxia (p.326). 
51. Calamagrostis (p. 
326). 
22. Perotis (p. 318). 
50. Polypogon (p. 
326). 
11. 
13. 
12. 
24. Imperata (p. 318). 
9. Setaria (p. 316.). 
10. Pennisetum (p. 
316.) 
y2 
