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



conspicuously silky; sessile and ped- 

 icellate spikelets about equal, the 

 first glumes strongly several-nerved; 

 awn of sessile spikelet twisted, genicu- 

 late, 20 to 30 mm. long. % — 

 Spontaneous on roadside banks, Cam- 

 eron County, Tex. Introduced from 

 Australia. 



Andropogon nodosus (Willem.) 

 Nash. Culms ascending from a de- 

 cumbent base, leafy, branching ; nodes 

 bearded; peduncle villous below the 

 inflorescence; racemes 1 to 4, approx- 

 imate, the sterile spikelets as con- 

 spicuous as the fertile, giving the 

 appearance of a flat 2-ranked scaly 

 spike, the first glume broad, obtuse, 

 many-nerved; awns slender, twisted 

 and bent, 15 to 25 mm. long. % — 

 Cultivated at experiment stations, 

 spontaneous along ditches in south- 

 east Texas, and formerly near Miami, 

 Fla. Has been confused with A. 

 annulatus Forsk., cultivated under 

 that name, and called "Angleton 

 grass." Established in a few of the 

 West Indian islands. Introduced from 

 Old World tropics. 



Andropogon ischaemum L. Culms 

 ascending, 70 to 100 cm. tall; nodes 

 glabrous; racemes nodding, few to 

 several, on slender peduncles aggre- 

 gate or somewhat distant on a slender 

 axis 3 to 5 cm. long, the sterile spike- 

 lets as conspicuous as the fertile, the 

 rachis and pedicels silky-ciliate ; awns 

 slender, twisted and bent, about 15 

 mm. long. % — Cultivated at 

 experiment stations, reported to be 

 a promising pasture grass in southern 



Figure 1173. — Andropogon saccharoides, X 1. (Hitch- 

 cock 5370, Tex.) 



lets slightly smaller, awnless or nearly 

 so; rare. % — Low open ground, 

 southern Louisiana and eastern Texas. 



Andropogon pertusus (L.) Willd. 

 Culms ascending, branching; racemes 

 few to several, aggregate on a short 

 axis, sparsely villous; first glume 

 pitted; awn of sessile spikelet genicu- 

 late, 10 to 15 mm. long. % — A 

 troublesome weed in lawns and 

 pastures, State College, Miss.; West 

 Indies; introduced from the Old 

 World. 



Andropogon sericeus R. Br. Culms 

 slender, leafy, 50 to 80 cm. tall, 

 branching; nodes bearded; racemes 

 2 to 7, aggregate, 3 to 5 cm. long, 

 nodding from a very slender peduncle, 



Figure 1174. — Andropogon exaristatus, X 5. (Type.) 



