No. 18. 
ANDROPOGON CIRRHATUS Hackel. 
Rootstock short. Roots strong. 
Culms tufted, 2 to 3 feet high, slender, branching above, of 6 to 8 joints ; iat- 
eral branches arising singly, slender, becoming long-exserted. 
Leaves. Sheaths narrow, close, smooth, striate ; heals short, truncate, smooth; 
blade 3 to 6 inches long, 1 to 2 lines wide, attenuated toa ~— acute point, rigid, 
smooth, except the roughish margins. 
nflorescence terminal on the culm and its branches, in a spike-like raceme 
about 2 inches long consisting of 10 to 15 joints; rachis smooth. 
ts in pairs. Female spikelets sessile, about 3 lines long ; fea glume 
linear-lanceolate, thick, 2-toothed at apex, smooth except the scabrous Icoel and 
margins, 7- to 9-nerved; second glume slightly shorter than the first, acute, much 
thinner, 3-nerved above, smooth; third glume one-fourth shorter than the first, 
yaline, linear-oblong, obtuse, 2-nerved, ciliate on the margins; fourth glume as 
long as the third, hyaline, bifid, attached below to an awn 6 to 8 lines long. Male 
spikelet rather shorter than the female, about equaling its pedicel; pedicel smooth 
except a tuft of cilia near the apex; glumes 4, much as in the female, but without 
the awn of the third glume. 
PLaTe XVIII; a, pair of spikelets; b, female spikelet opened to show the 
parts; ¢c, male spikelet opened. 
This is related to the broomsedge (A. scoparius), and is rather rare. 
