GENERA OF GRASSES OF THE UNITED STATES. 
241 
123. Tricholaena Schrad. 
Spikelets on short capillary pedicels; first glume small, much 
shorter than the spikelet, villous; second glume and sterile lemma 
equal, raised on a stipe above the first glume, emarginate or slightly 
lobed, short-awned, covered, except toward the apex, with long silky 
hairs, the palea of the sterile lemma well developed; fertile lemma 
shorter than the spikelet, cartilaginous, smooth, boat shaped, obtuse, 
the margins thin, not inrolled, inclosing the margins of the palea. 
Perennial or annual grasses, with rather open panicles of silky 
spikelets. Species about 15, in the Eastern Hemisphere, mostly in 
Africa, one cultivated in the United States. 
Type species: Tricholaena micrantha Sclirad. 
Tricholaena Schrad. ; Schult., Mant. 2: 163. 1824. Three species are de- 
scribed, but the second and third are included in the genus with a question. 
The first species is taken as the type. » 
Tricholaena rosea Nees (fig. 147), Natal grass, is becoming an 
important forage grass in the sandy lands of Florida, where it has 
been recently introduced. It is an upright, rather slender perennial, 
2 to 4 feet tall, with beautiful purple panicles, 4 to 10 inches long. 
The color varies from light purple or pink to wine color. Although 
a perennial, it is usually cultivated as an annual, as it will not survive 
temperatures below freezing. 
124. Chaetochloa Scribn. 
{Setaria Beau v.) 
Spikelets subtended by one to several bristles (sterile branchlets), 
falling free from the bristles, awnless; first glume broad, usually 
less than half the length of the spikelet, 3 to 5 nerved ; second glume 
and sterile lemma equal, or the former shorter, several-nerved; fer- 
tile lemma coriaceous indurate, smooth or rugose. 
Annual or perennial grasses, with narrow terminal panicles, these 
dense and spikelike or somewhat loose and open. Species about 65, 
in the tropical and warm temperate regions of both hemispheres ; 18 
species in the United States. 
Type species : Panicum viride L. 
Setaria Beauv., Ess. Agrost. 51, pi. 13, f. 3, 1812, not Acharius, 1789, nor 
Michaux, 1803. Fourteen species are listed, viridis being illustrated. Pani- 
cum viride L., on which this species is based, is taken as the type. 
Chaetochloa Scribn., TJ. S. Dept. Agr., Div. Agrost. Bull. 4: 38. 1897. Scribner 
proposes the name Chaetochloa for Setaria Beauv., stating that the name Setaria 
was first used by Beauvois (Fl. Owar. 1809) 1 for a species of Pennisetum. 
Scribner himself applies the name Chaetochloa to the species allied to Panicum 
viride. Hence it seems that he wished to substitute Chaetochloa for Setaria 
as used by Beauvois in his Essai (Ess. Agrost. 51, pi. 13, f. 3, 1812). The figured 
species, Setaria viridis (L.) Beauv., becomes the type. 
The name Ixophorus Schlecht. was applied to this genus by Nash, 2 but that 
is based on a Mexican species not congeneric with ours. 
1 According to Dr. J. IT. Barnhart the part containing Setaria (PI. Owar. 2: 80) was 
not published until 1818. 
2 Britt,on and Brown, Illustr. Fl. 1: 125. 1896. 
977G9°— 19— Bull. 772 16 
