Andropogon. TRIANDRIA DIGYNIA, 257 
Annual, with numerous, nearly straight, erect, ‘smooth, 
slender, pithy culms, of from one to two feet in height. Leaves 
taper from the base, most acute, about as long as the joints 
of the culms; a few long soft hairs on the inside near the base. 
Sheaths smooth, shorter than the joimts. Spikes two, rarely 
three, and I have not seen four, one sessile the other two a lit- 
tle more elevated on a common pedicel, expanding ; from 
two to three inches long. Rachis jointed, winding, and hairy. 
Flowers im pairs, one sessile, the other pedicelled, both her- 
maphrodite, and both awned, Ca/yces two-valved ; valve- 
lets lanceolate, ciliate; backs smooth, and brown. Corol of 
two, small, pellucid, brownish valves, the inner of each, ends 
in a long, brown, arista, proceeding from the bifid apex of 
the valvelet, 
8. A, tridentatus, R. 
Spikes paired, hirsute, both flowers sitesi, and 
awned, Calyces shaggy, exterior valves en — 
tridentate. Corods four-valved. fame 
A delicate, rather tall species; a native of niente 
- Culms straight. Leaves small. Spikes terminal, paired, 
sessile, lanceolate, shaggy. Flowers in pairs; one sessile, 
the other short-pedicelled, both hermaphrodite, and both 
awned, Calyx, exterior valves in both flowers cuneiform, 
with apices truncate, tridentate, back striated ; middle part, 
as well as the margins from thence down, and the base beard- 
ed with fulvous hairs; inner valve longer than the exterior, 
ending in a pretty long arista; margins amply fringed with _ 
long fulvous hairs, — Corol in both flowers wpe 8 ae 
exterior one on the ante watts and reser ec 
OLA. . oncenatas Re : — 2 en! : y 
iliate cled. Sessile or Pecipieodite 
flower awn “ Fait (cad aiargta of the exterior valve of the 
calyx seutely pectinate, serrate. 
e ¥ot, 1. Q 
