No. IS. 

 ANDROPOGON CIRRHATUS Hackel. 



Hoof stock short. Roots strong. 



Culms tufted, 2 to 3 feet high, slender, branching above, of 6 to 8 joints ; lat- 

 eral branches arising singly, slender, becoming long-exserted. 



Leaves. Sheathsnarrow, close, smooth, striate ; ligule short, truncate, smooth; 

 blade 3 to 6 inches long, 1 to 2 lines wide, attenuated to a long acute point, rigid, 

 smooth, except the roughish margins. 



Inflorescence terminal on the ciilm and its branches, in a spike-like raceme 

 about 2 inches long consisting of 10 to 15 joints; rachis smooth. 



Spikelets in pairs. Female spikelets sessile, about 3 lines long ; first glume 

 linear-lanceolate, thick, 2-toothed at apex, smooth excej^t the scabrous keel and 

 margins, 7- to 0-nerved; second glume slightly shorter than the first, acute, much 

 thinner. 3-nerved above, smooth; third glume one-foiirth shorter than the first, 

 hyaline, 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; o, pair of spikelets; h. female spikelet opened to show the 

 jjarts; ('. male spikelet opened. 



This is related to the broomsedge {A. scoparius), and is rather rare. 



