The Collaborative International Dictionary of English v.0.48:

Andropogon \An`dro*po"gon\, n. [NL.; Gr. 'anh`r, 'andro`s, man +
   pw`gwn the beard.] (Bot.)
   A very large and important genus of grasses, found in nearly
   all parts of the world. It includes the lemon grass of Ceylon
   and the beard grass, or broom sedge, of the United States.
   The principal subgenus is Sorghum, including Andropogon
   sorghum and Andropogon halepensis, from which have been
   derived the Chinese sugar cane, the Johnson grass, the Aleppo
   grass, the broom corn, and the durra, or Indian millet.
   Several East Indian species, as Andropogon nardus and
   Andropogon sch[oe]nanthus, yield fragrant oils, used in
   perfumery.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Andropogon
    n 1: tall annual or perennial grasses with spikelike racemes;
         warm regions [syn: Andropogon, genus Andropogon]