ANDROPOGONE^. 39 



Kunth describes this grass in his supplement, and at the close 

 remarks that it is hardly distinct from H. frijisacoides H.B. 



It is also so considered by Hackel. 



Texas and Arizona. Rothroelc 638. 



14. (94). Andropogon L. Sp. PI. 1045 (1753). Dichantliium 

 Willem. Ust. Ann. 13ot. 18 : 11 (1796). Sorghum Pers. Syn. 



1 : 101 (1805). Heteropogon Pers. Syn. 2 : 533 (1807). Diectomis 

 Beauv. Agrost. t. 23./. 5 (1812). Cijmhopogon Spreng. Pugill. 



2 : 14 (1815). Clirympogon Trin. Fund. Agrost. 187 (1820). 

 Lepeocercis Trin. Fund. Agrost. 203 (1820). Schizachyrimn 

 Nees, Agrost. Bras. 331 (1829). Hypogynium Nees, Agrost. Bras. 

 364 (1829). EuMastaxon Steud. Flora. 33 : 1.229 (1850). Gym- 

 nantlielia and Hyparrhenia Anderss. Nov. Act. Upsal. 2 : 231 

 (1856). 



At least twenty other synonyms have been discovered. 



Spikelets 1-flowered or empty, in pairs, or by the suppression of 

 1, single, the axis often terminated by 2 pedicellate spikelets by the 

 side of 1 sessile, either in the alternate notches of the articulate 

 rachis of simple spikes, or else paniculate, 1 sessile, perfect (or 

 rarely staminate) and fertile, the other pedicellate and barren, 

 either staminate or empty. Glumes in the fertile spikelets 4, the 

 outer 1 the largest, awnless, or with a straight awn, several-nerved, 

 but often almost 2-keeled, with 2 nerves near the margin much 

 more prominent than the others; second glume keeled, rarely pro- 

 duced into a short straight awn, third glume much smaller, hyaline 

 and empty, fourth or terminal glume very slender, flexuose and 

 stipe-like at the base, or if dilated hyaline, entire or bifid at the 

 apex, usually with an awn, either terminal or from the notch, rigid 

 and twisted in the lower part, bent back and very fine above tlie 

 middle; palea small, hyaline, or 0. Lodicules cuneate. Glumes 

 of the barren spikelet 4 or fewer, the outer one the largest and 

 many-nerved, second keeled, third and fourth, when present, small, 

 thin and hyaline, all awnless. Stamens 3. Styles distinct. Grain 

 enclosed, but not adherent. Culms usually destitute of a hollow 

 inside, hard, often flattened, dark red or brown near the nodes. 

 Leaf-blades usually very narrow, never cordate, pedicels and joints 

 of the rachis usually ciliate or villous. 



