182 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
ing from the pedicels entire, singly, in groups, 
or together with joints of an articulate rachis; 
spikelets, or at least the fruits, not laterally 
compressed (except in Lithachne). 
Lemma and palea (the latter sometimes wanting 
in Andropogoneae) hyaline; glumes more 
or less indurated, the first largest; sterile 
lemma like the fertile in texture. 
Plants moncecious. (MAYDEAE.) 
Staminate spikes in a terminal panicle; 
pistillate spikes in the axils of the 
leaves, sometimes bearing also 
staminate spikes................. 1. EucHLAENA (p. 195). . 
Staminate and pistillate florets in the 
same spike, the staminate-upper- 
most. 
Spikes digitate, the rachis of pistil- 
late portion bony-indurated, 
disarticulating with spikelets 
attached..............0.0.0.. 2. TRIPsACUM (p. 195). 
Spikes paniculate, the pistillate 
spikelets inclosed in ovoid 
pearly or grayish, bead-like 
bodies, the staminate portion 
protruding from a small ori- 
fice. 2.2... eee elec eee 3. CoIx (p. 196). 
Plants not monecious, but the inflorescence 
often consisting of staminate or neutral 
spikelets intermixed with perfect 
ones. (ANDROPOGONEAE.) 
Spikelets all alike, perfect: inflorescence 
conspicuously hairy. 
Rachis of spike continuous; inflo- 
rescence a narrow spike-like 
panicle; spikelets awnless... 4. IMPERATA (p. 197). 
Rachis breaking up into joints. 
Spikelets awned; inflorescence 
4 harrow or open panicle. 6. ERtanruus (p. 197). 
Spikelets awnless; inflorescence 
a dense interrupted 
golden brown spike-like 
panicle. ............... 5. Ertocurysis (p. 197). 
Spikelets not alike, part perfect and 
part staminate or neutral. 
Joints of the rachis much thickened 
and excavated, the spikelets 
fitting into the recesses. 
First glume of perfect spikelet 
hemispherical, _ pitted; 
plants annual........... 10. Rytm1x (p. 198). 
First glume of perfect spikelet 
flat or somewhat convex ; 
plants perennial. 
