8 
KEY TO THE GENERA. 
Primary Series A. PANICACE,—Spikelets articulate on the pedicels 
below the glumes. Spikelet with one fertile flower, the male or barren flower, 
if any, below it. 
Tribe I.—Pantcex.—Fertile spikelets with one terminal bisexual or 
female flower, with or without a male one below it. Glumes four or three, 
the upper flowering one of a firmer texture, the outer one usually smaller, 
sometimes wanting. A palea to each flower. Stamens three, rarely fewer. 
Grain enclosed in the hardened (rarely thin, but stiffened) upper glume and 
palea. Awns rare, and when present neither twisted nor bent back. 
Series i. Spikelets bisexual. 
Infloresence not bracteate. No bristle-like involucre. 
Fruiting glume hardened. 
Spikelets with three glumes. 
Pedicels not callous atthe summit. lower- 
ing glume not awned ... =a ... 1. Paspalum. 
Pedicels with a callous annulus or cup at 
the summit. Flowering glume with a 
point or short awn... sea ... 2. Eriochloa. 
Spikelets with four glumes. 
Outer glume shorter than the others, often 
minute, not awned _... ae ... 0. Panicum. 
Outer glume with a long awn a ... 4, Oplismenus. 
Spikelets surrounded by or intermixed with abortive 
branches of the panicle, forming a lobed or 
bristly involucre. Fruiting glume hardened. 
Spikelets intermixed with long persistent bristle- 
like branches, and falling off fromthem ... 5. Setaria. 
Inyolucres crowded or distant along a simple 
rhachis, each enclosing one to three 
spikelets, and falling off with them. 
Involucres of numerous simple or plumose 
bristles completely surrounding the 
spikelet ... oe ss = ... 7. Pennisetum. 
Involucre of severai outer bristles and inner 
flat lobes completely surrounding one 
to three spikelets and at length hardened 8. Cenchrus. 
Branches of the particle produced beyond the base of 
the last spikelet. Fruiting glume stiff, but 
scarious and rather thin. 
Spikelets solitary, or few along the slender in- 
articulate branches of the panicle ... 9. Chameraphis. 
Series ii. Spikelets unisexual. 
Stems prostrate. Spikelets dicecious, in dense heads 18. Spinifex. 
Tribe TI.—ANDROPOGONEEH.—Fertile spikelets with one terminal bisexual 
or female flower, with or without a male one below it. Glumes four or 
rarely fewer, one of the outer ones the largest enclosing the fruit, the third 
smaller, thin and hyaline, sometimes wanting, the upper or flowering one 
