ANDROPOGONEZ 
169 
callus, the whole much resembling the awned fruit of 
Stipa spartea. 
208. Andropogon L.—Sessile spike- 
lets all alike in more or less elongated 
racemes. The racemes may be single or 
in pairs, or rarely 3 or 4 from a sheath- 
ing bract, or they may be in naked 
panicles. The species are usually coarse 
perennials that inhabit prairies, hills, 
pine-barrens and other dry places. Some 
species are important native forage 
grasses. Two of these are common on 
the prairies of the Mississippi Valley, 
the little bluestem (A. scoparius Michx.) 
and the big bluestem (A. furcatus Muhl.) 
(Fig. 16). The first species has solitary 
racemes from each bract or spathe, and 
is a representative of the subgenus 
Schizachyrium. The other has 3 or 4 
racemes in a naked digitate cluster. A 
common but less valuable species, the 
broom-sedge (A. virginicus L.), is found 
in the Atlantic states on sterile soil. 
This large genus of hundreds of species 
is spread over the warmer regions of 
both hemispheres. 
209. Cymbopogon Spreng—tThis 
genus resembles Andropogon in having 
racemes in pairs from sheathing bracts, 
but differs in that 1 or 2 of the lower- 
most pairs of spikelets of at least 1 of 
the racemes, are both staminate. In the 
economic species the pairs of racemes 
Fie. 16. Andropo- 
gon furcatus. Inflores- 
cence, Xl. A joint 
of the rachis with a 
fertile spikelet below 
an a  staminate 
spikelet above, X65. 
