on) 
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. Spikelets in atecrtcd panicles 
113 
: — —— 2-3-flowered, oe the sterile with numer- 
awn-pointed glume . CyNosuRus 
F Fertile mliela 1-flowered, long- Seat the sterile with many 
obtuse glumes 116. LAMARcKIA 
Plants dicecious 8 
Plants not dicecious 11 
‘Spikelets goons concealed in the axils of the crowded, short, 
and rigid lea . MonanTHOocHLo# 
. Flowering glumes 3-nerved, Geant Lae midnerve extending 
3 
into a fine awn. Tall reed-like gra . GYNERIUM 
. Flowering glumes 5- to cpyaahady broad, ovate, or oblong, 
awnless 10 
. Flowering glumes many-nerved, coriaceous; spikelets few in 
short, spike-like panicles 112. DisticHLis 
. Flowering glumes 5-nerved, herbaceous orchartaceous.117. Poa 
. Empty glumes 3 to 6 below the first flowering glume--...-. 12 
. Empty glumes 2, or rarely only 1, below the first flowering 
glume 13 
Fi = We ere a - sa to +h + A all awn- 
less. Tall grasses with strongly compressed sel 
111. Untota 
2. Third and fourth glumes very unlike the first and second, 
3-nerved and 3-awned. Low, desert ee 
. BLEPHARIDACHNE 
. Racnilla or flowering glumes clothed with long hairs exceeding 
L 
the glumes in length. Tall, reed-like grasses .......... 
. Rachilla or flowering glumes naked or with hairs shorter than 
16 
the glum 
+ 
. Leaves narrow and very long, chiefly radical; culms solid. 
Leaves broader, chiefly cauline; culms hollow -....-.----- 
. Hairs on the rachilla only. ....-.----..-.--- 95. PHRAGMITES 
Hairs on the flowering glumes, the rachilla naked. 
94, ARUNDO 
. Culms dichotomously branched; leaves crowded in dense 
icles 
at the nodes or ends of the branches... 91. Munroa 
3. Culms mg dichotomously branched; leaves not in dense 
4 
