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2 
The genus Huchlana is cultivated in the South as a forage plant 
under the name of Teosinte. 
The genus Zea, species mays, is commonly and extensively culti- 
vated throughout the country, and is known as maize or Indian corn. 
As natives of this tribe we have only the genus Tripsacum. 
2. Tribe ANDROPOGONE A. 
Spikelets in racemes or spikes, most commonly in twos, occasionally 
in threes, at each joint of the (usually) articulate rachis, one sessile 
and one pediceled, or the terminal ones in threes. Spikelets homoga- 
mous or heterogamous, generally 1-flowered, with 3 empty glumes; 
first empty glume more indurated than the inner ones, and than the 
flowering glume, the latter often hyaline and bearing a bent or twisted 
awn. Palet usually minute, sometimes absent. Stamens 3, rarely 2 or 
1. Style free, stigma plumose. 
GROUP 1. 
Spikelets in spike-like racemes, awnless, generally in pairs in alter- 
nate notches of the generally articulate rachis: one, rarely two, sessile 
and fertile, more or less imbedded in an excavation of the rachis, the 
other pediceled and sterile. 
A. General rachis not deeply indented at the joints..... one neeee ELIONURUS, 6 
B. General rachis deeply indented or excavated at the joints. 
I. Spikes more than an inch long; sessile spikelets flat or convex. 
ROTTBELLIA, 7 
II, Spikes less than an inch long ; sessile spikelets small and globular. 
MANISURIS, 7 
GROUP 2. 
Spikelets in pairs or threes, one sessile and fertile, and one or two 
pediceled, male, empty or defective, arranged in spikes or loose race- 
mose panicles, the flowering glume of the sterile flower commonly 
awned. 
A. Sessile spikelets male, the pedicellate one perfect.........-- TRACHYPOGON, 7 
B. Sessile spikelets perfect, the pedicellate one male ...-. .---- HETEROPOGON, 8 
Group 3. 
Inflorescence paniculate, consisting of many spike-like racemes of 
numerous joints; spikelets in pairsor threes, the sessile one fertile, 
usually awned, the pedicellate one either fertile, male or imperfect. 
Axis of the racemes distinctly articulate (usually bearded). 
A. Spikelets in pairs along one side of a simple spike, or of the spike-like 
branches of a simple panicle.......--....--2. .2-22. eee ANDROPOGON, 9 
B. Spikelets in single or few pairs on the branches of a more or less compound 
panicle 
