746 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



Andropogon nodosus (Willem.) Nash. Decumbent, freely branch- 

 ing, low perennial, with flat blades 2 to 8 cm long, and solitary or 

 paired racemes, the sterile spikelets as conspicuous as the fertile ones, 

 giving the appearance of a flat 2-ranked scaly spike; awns slender, 

 twisted and bent; peduncle pubescent below racemes. % — Old 

 World species, established in a few of the West Indian islands; has 

 been collected at Miami, Fla. 



Figure 1662.— Distribution of 

 Andropogon barbinodis. 



Figure 1664.— Distribution of 

 Andropogon saccharoides. 



Figure 1665.— Andropogon exaristatus, X 5. (Type.) 



Figure 1663. — Andropogon saccha- 

 roides, X 1. (Hitchcock 5370, Tex.) 



CYMBOPOGON Spreng. Oilgrass 



Closely allied to Andropogon; the pairs of racemes included in an 

 inflated spathe, the spathes in a large compound inflorescence; sessile 

 and pedicellate spikelets of lower pair alike, well developed, but 

 staminate or neuter. Robust mostly aromatic perennials, including 

 the oilgrasses of commerce. The most important are Cymbopogon 

 nardus (L.) Rendle, citronella grass, nard grass, in which the first 

 glume of the sessile spikelet is flat on the back, and C. citratus(DC) 

 Stapf, lemon grass, in which the first glume is concave on the 

 back. These species are sometimes cultivated in gardens in southern 



