509 
49. P, Havardii Vasey. Culms 1 to 2m. high, erect, from strong rootstocks: 
leaves involute, rigid, long-pointed: panicle 3 to 5 dm. long, loose; branches rather 
rigid, bearing few spikelets on the divergent subdivisions: spikelets 6 mm. long, 
ovate, acute; first glume one-half as long as the second and third; these equal.— 
Mountains and rocky ravines, western Texas. 
50. P. miliaceum L. (MiLLer.) Culms 1 to 1.5 m, high, often branching, weak 
and decumbent, hispid pubescent as are also the sheaths and often the flat blades: 
panicle 1 to 3 dm. long, rather dense; branches numerous, slightly spreading, much 
subdivided: spikelets 4 to 5 mm, long, ovate, acuminate; first glume one-half as 
long as the spikelet; second and third nearly equal, exceeding the shining, sub- 
acute floret.—Introduced and cultivated. 
++ ++ Spikelets not turgid. 
51. P. jumentorum Pers. (GUINEA GRASS.) Culms in ‘ bunches,” robust, 1 to 2 
m, high, pubescent at the nodes: leaves 3 to 6 dm, long; sheaths and often the 
blades thinly pubescent: panicle 3 to 6 din. long, of numerous, virgate branches: 
spikelets oblong, subacute, 3 mm. long; first glume one-third as long as the spike- 
let; perfect floret transversely rugose. (P. maximum Jacg.)—Introduced and eulti- 
vated near the coast. 
52. P. gymnocarpon Ell. Culms erect, about 1m, high: leaves lanceolate, cor- 
date-clasping, smooth thronghout: panicle 2 to 4dm, long, axis and branches angu- 
lar: spikelets in rather close clusters of 2 to 4, narrowly lanceolate, 4 to 6mm, long; 
the three outer glumes awn-pointed, much longer than the floret.—Eastern Texas 
and eastward in low land, near the coast. An anomalous species, appearing more 
like Ichnanthus. 
17. OPLISMENUS Beauy. 
Spikelets in small sessile distant one-sided clusters in a simple 
panicle; the first and second empty glumes and frequently the third 
awned, the awn of the lower one longest; 2-flowered, the lower flower 
staminate or neutral. 
1. O. setarius (Lam.) R. & S. Culms weak, ascending from a decumbent or 
creeping base, 3 to 6din. long: leaves ovate, lanceolate, 3 to5 em, long, thin, smooth: 
panicle racemose, about Ldm. long: spikelets in clusters of 4 to 10, lanceolate, nearly 
3mm. long; the first and second glumes one-half as long as the spikelet; the third 
exceeding the perfect floret; the three awns respec tively about 6 mm., 2 mm. and 
1 mm. long. (Panicum setarium Lam,)—Woods and wet land near the coast. 
18. SETARIA! Beauv. (BRISTLY FOXTAIL.) 
Inflorescence a cylindrical spike-like or sometimes interrupted pan- 
icle, with several persistent bristles below the articulation of each 
spikelet: spikelets as in Panicum; the first glume small, the second 
and third alike, the third being the floral glume of a neutral or stam- 
inate floret; terminal floret perfect, with hardened glume and palet, 
usually rugose. 
* Rristles barbed upward, 
+ Spikes simple: perfect florets plainly rugose. 
1. S. glauca (L.) Beauv, (PIGEON-GRASS, YELLOW FONX-TAIL.) Culins 8 to 6 dm. 
high: leaves hispid: spike 3 to 8 cm. long; bristles 6 to 12 in a cluster, tawny or 
rarely purple: spikelets nearly 3 nm, long; perfect floret subacute at each end,— 
Introduced in cultivated tields. Var. Lavicara (Muhl.) Chapm, has smooth leaves 
and culm.” (Panicum laecr igatum Muhl.)—Damp soil near the coast. 
- Setaria although a a homony m is retained here provisionally, as the combination of this genus with 
Chameraphis RK. Br. does not appear to be satisfactory. 
