Andropogon. ] GRAMINE# (Stapf). 335 
Lower glume dorsally flattened; keels 
broadly winged above... ae ... (9) distachyus, 
Subgenus IV. snes rt ogi Racemes all pe- 
duncled, joints of the rhachis many (in the 
South imo akeygaer to few, like the pedicels 
linear, compressed, a translucent channel 
d thickened margins : 
Racemes —— te or cana lower exceeding 
the mon rhac 
Lower aim of ae er not pitted .. (10) Ischemum. 
glume of sessile spikelets pitted . .. (11) pertusus. 
Racemes “panicled, lower shorter than the com- 
rhac be . (12) intermedius. 
Subgenns - coeiadie Racemes all pedun neled, 
joints of the rhachis 8-1, and like een dai els 
opaque; racemes usually 3-8-, etimes 
pete eae pe "apie elets rr grains 
dorsal essed ; a ciate (in the 
So uth “Aftienn species) or 
rennial ; rhachis ay Misi se engin .. (13) halepensis. 
ramen rhachis of raceme tough ... . (14) Sorghum. 
Be Vi; Cu RYSOPOGON. Racemes L-articu- 
k 
bearded tips of the branches of the panicle (15) monticola. 
B. HETEROZYGI. Sessile si of the lowest 1 
or more pairs, differing those above in sex or 
form (if the racemes are 2. pane this is the case at 
n ao but differing in xs annulatus. 
sessile spi 
are cylindric . ae ... (17) contortus. 
subte 
quently in he urious leafy or spat thaceous = 
seikslen a6 _ di er ring in sex and form 
Column of awn glabrous: 
ee “densely tutted, with intravaginal innova- 
sh ; lower sheaths firm, fugaciously 
aiey to psn at the base joao i 
s more or less winged above (18) Nardus. 
Lower — ig ene eg concave below 
hetw: the rounded keels which are a 
scarce ely win pal reine . (19) plurinodis. 
Culms fascicled, frequently wi ith extravaginal 
innovation shoots, or annual; sheaths 
glabro 
abrous, subhe baceous ; lower glume tg 
spikelets dorsally flatten h a narrow 
oove from the middle wards corre- 
ding to a keel inside fic oe .. (20) Schenanthus. 
spon 
reg of awn pubescent or hirsu eee 
f ¢ spikelets very soot or ure, 
blab: 
