44. 
310 
Spikes sessile in pairs on a common 
peduncle under each bract 
Spikes not as above 
. Spikelet singly pedicellate, awnless or 
with a straight or rarely twisted aw 
Spikelets in twos or threes, one or more 
pedicellate ; flowering glumes very 
thin, wv aa with a twisted awn 
or rarely 
No glumes indo the foarte: ones . 
Outer empty or male a 2-3 
Spikelets unisexual, ovate 
Spikelets bisexual, bw 
. Outer empty or male glumes 2 
Outer empty or male glumes 3 
Awns 0-2 
Awns 3, flowering glume convolute, 
spikelet 
. Flowering Jim l thes. uta ; 
leaves linear 
Flowering g enne shorter than one or all 
r or leaves o 
51. Spikelets hihi. 3 inch 
Spikelets more than j inch ... 65 
52. Spikelet with a callous base ... psa 
Spikelet without callous base ... a 
53. Spikelets less than $ inch long — 
Spikelets over 1 inch long 
54, Flowe esed glumes thicker than outer 
51. 
58. 
59. 
Flowering glumes thinner than outer 
woe 
: Spikelets not articulate on pedicel A 
Spil 
lets articulate on n pedicel me 
[2] 
Outer glumes longer than flowering ones 
Flowering glume appendaged at base... 
J ^ MET d NU 
Fl 
loweri 
No Krag amat beri pe sae 
Pane 
anicle with sheathing bracts at 
ramifications 
Panicle without sheathing bracts at its 
ramifications 
... 
its 
ose see 
: Crmbopeger (p. 
wo 
m. opogon (p. 
22). 
15. 
Lib 
Zizania (p.3 
sia (p. 3 
pi pot 
54. 
50. 
. Aristida (p. 325). 
53. 
51. 
Sphaerocaryum 
317). 
[A 
m 
à Xonechlon 
o2 
(p. 
313.) 
18. Garnotia (p.317). 
. Sporobolus (p. 
16. Oryza (p. 317). 
$5. 
56. 
4. Isachne (p. 313). 
5T 
. Thysanolaena (p. 
21 
318). 
20. Arundinella (p. 
318). 
7. Ichnanthus (p- 
316). 
58. 
6. Panicum (p.314). 
9. Setaria (p. 316). 
60. 
64, 
