38 
male or sterile one. Empty glumes 3, the lower one small, the second 
usually shorter than the third, the flowering glume indurated; the 
second flower when present consisting of a thin palet and sometimes 
4 stamens. 
* Bristles barbed upward. 
1. Setaria viridis Beauv. (GREEN FOXTAIL, PIGEON GRASS.) (Gray’s Manual, 6th 
ed., p. 634.) Spikes 2 to 4 inches long, strictly erect, cylindrical, dense, tawny yellow 
(exceptin varieties); flowering glume transversely wrinkled, bristles 6 to 10 in cluster, 
much longer than the spikelets.—Very common in cultivated fields, ete. 
2. S. glauca Beauv. (FOXTAIL, PIGEON GRASS.) (Gray’s Manual, 6th ed., p. 634.) 
Spikes 2% to 4 inches long, strictly erect, cylindrical, dense, tawny yellow (except in 
varieties) ; flowering glume transversely wrinkled; bristles 6 to 10 in a cluster much 
longer than the spikelets. —Extensively naturalized. 
There is a smooth, perennial form in the Southern and Southwestern States, called 
by Dr. Chapman var. L&vIGATa. There is also a form in the South with purplish 
bristles. , 
3. S. imberbis R. & 8S. Syst. u. 891. Spikes very narrow (2 to 3 lines wide), 2 to 
3 inches long, not so dense as in S, glauca, and the bristles (yellow to purple) much 
shorter, as long or twice as long as the spikelets; leaves narrow, erect.—Texas and 
southwestward. 
4. S.corrugata Schultes. (Chapm. Flora 8, States, p. 573.) (Panicum corrugatum 
Ell.) Culms 2 to 4 feet high, often branched below; leaves narrow, 6 to 12 inches 
long; spike cylindrical or tapering to the apex, dense, erect, or bending, 3 to 6 inches 
long; branches of panicle 6- to 10-flowered; fertile flower, strongly convex, trans- 
versely rugose, smaller than in 8S. glauca; bristles much exceeding the spikelets; pur- 
plish.—Dr. Chapman says, ‘‘Dry soil, Florida and Georgia.” 
5. S.ItalicaKth. (Gray’s Manual, 6th ed., p.634.) Culms1}to3 feet high; leaves 
wide; spikes oblong to cylindrical, dense, more or less compound, thick, nodding ; 
bristles yellowish or purplish, longer or shorter than the spikelets, 
Exceedingly variable under cultivation. Cultivated as millet or Hungarian grass.— 
A native of Europe, rarely spontaneous. 
6. S.composita Kth. (Chapm. Fl. 8. States, p.578.) Culms smooth, 2 to 4 feet 
long; leaves 1 foot or more long, the fringed sheaths rough, hairy at the throat ; 
panicle 6 to 12 inches long, loose, compound, tapering to the apex, the lower clusters 
spreading or scattered, } to 1 inch long; perfect flower, acute, with faint transverse 
lines. Much like S. setosa.—Dry, sandy soil, Florida, Apalachicola to Key West. 
7. S. macrostachya H. B. K.? perhaps S. magna Griseb, (Kunth Enum, Plant, 
1, p. 154.) Culms 4 to 8 feet high, thick, smooth; leaves } to 1 inch wide, a foot 
or more long, very rough; spike 1 foot to 18 inches long, nearly cylindrical, tapering 
at the apex, very dense, the lower clusters scattered ; fertile flower smooth, smaller 
than in the preceding bristles 1 or 2 to each spikelet, much longer than the clusters.— 
Swamps along the coast North Carolina to Florida and west to Mississippi. Con- 
fused by Dr. Chapman with S. Jtalica, 
8. S. setosa Beauv. Agrost, p.178. (Paniewm setosum Trin.?) Culms 2 to 4 feet 
high, apparently «nnual, sometimes branched below, smooth; leaves often 1 foot 
long, three-fourths inch wide, sometimes scabrous; ligule ciliate, lower sheaths shorter 
than the internodes; panicle 6 to 19 inches long, not cylindrical, tapering to the apex 
erect or somewhat nodding, loose or somewhat dense, compressed, the erect, spreading 
branches ¢ to 1 inch long; lower glume one-fourth, second glume three-fourths as 
long as the third, perfect flower acute, transversely rugose.—Texas, New Mexico, 
Arizona and Mexico. Resembles No.6, but with smaller spikelets. Secms to pass 
gradually into the next species. 
9. S. caudata Rk. & 5. Syst. u. p. 495. Culms 2 to 3 feet high, apparently 
perennial, much branched, sometimes decumbent and rooting below; panicle cyl- 
