: - GRASS FAMILY. — 367 
3. Tue Panicum Sus-tR1BE. 
Spikelets gomedia, but the lower floret always imperfect, either 
staminate or neutral ; in in the latter case reduced toa O. th ‘empty 
we 1 if @ 
flow Rarely both glumes are ab 
§1. Falow ‘of aot fertile foteu coriaceous or chartaceo whiess 
not keeled, e acing the smooth grain, flattened paratict ‘with the 
Therbeteotee re 
Spikelets appear wered Hig the suppression of the 
ba r glume ; the si ‘ek “empty palea of the neutral flower oc- 
upying its place. Spikel oinved with their short pedicels. 27. Paspatum. 
spikelets ts manifestly 14 -2- -sowere a Nee lower floret neutral or 
te), bit lower aga esent. 
a epikel elets n aint nor rie pA ree bristle-bearing. 
= pon glume sma re minute. Sterile flower staminate 
spikelets a the peduncles continued beyond 
a bristle. Otherwise as in 28. 
spikeot aed 1-5 together in a hard and spiny bur- oe 
like’ tirvolt Ce 30. CENCHRUS. 
Je% a pig or scarious, always of thinner and more 
than the Nba indurated) glumes, 7 reqhently ? 
Ny ape. Spikelets ay pairs or threes, panicled 
or spiked ; m cecious or ais 
Spikelets monoecious; the Distillate ¢ ones imbedded in the rachis 
of the — spike or in its separable joints. The stami- 
abies E 
Pistillate spikelets ene in the joints of the spontane- 
ously sennge rachis. 
Pistillate spikelets one the sides of a continu us rachis, 
which is enclosed by the sheaths of Stertive ‘eave or 
usks. 
Spikelets polygamous. Fertile spikelets with one perfect and one 
sterile (staminate = mostly neutral) floret. Lower palea of the 
perfect fower awn: 
. PANICUM. 
31. TripsacuM. 
32, ZEA 
— — in ed sg re each joint of the rachis, one pedicellate the 
ome ‘ipper r floret in each spikelet fertile. 33. SACCHARUM. =~ 
The sessile Sy only fertile. 34. ANDROPOGON. 
on . —_ loose open panicles, the lateral ones 
rudiments. 
cet ner 35. SorcHUM 
