_ racter; having a 
64. 
‘FRIANDRIA, DIGYNIA. 44 
before evolution; ligula entire, conspicuous. Calix 2- 
valved, 1-flowered, valv« 
the length of the corsa 
the corolla contra 
only about one thi 
nerve ending in a cu 
glume at its base, nerves 
-ventricose and gibbous, above 
valved, short, nearly oval, in fruit almost spherical, valves 
coriaceous, vested with an fit co ff villus, extend- 
ing beyond the corolla, the dorsal valve terminated by a 
triquetrous pungent deciduous awn scarcely the length + 
of the calix, at first perfectly erect, afterwards a little 
bent; the inner valve entirely enclosed by the outer and 
without awn. Stamina-3, scarcely exserted beyond the 
valves of the corolla; anthers smail, brown, bifid at both 
extremities, above terminated by small pubescent tufts. 
Style 1. Stigmas 2, short, hirsutely villous. Ovartum 
sheathed. by a 3-leaved perisporium (or nectary). Seed 
nearly spherical. 
_ This genus is very nearly allied to Oryzopsis, but at 
the same time stifficiently distinct both in hab\t and cha- 
inga eulm with remarkable long sheathing 
and almost filiform subulate leaves, a dichotomous spread- 
ing panicle, a ventri LW ow 
2, coarctate, awned calix twice the 
s membranaceous, about twice’ 
a 
length of the’coro! ich last is furnished with a deci- a 
duous awn, and a long silky villus. — ag 
HazitatT. On the grassy plains of the Missouri, 
from the Arikaree village to the Northern Andes? Flowers 
in Juneand July. ~ 
Order 2,.—D1GYNIA. 
+ Calia 1-flowered, flowers scattered. _ 
MUHLENBERGIA. Schreber. Drurrr~ 
RUM. JMichaux. 
Calix very minute, truncated, 2-valved. -un- 
equal, Corolla g-valved, hairy at the base, ex- 
terior valve terminating in a slender awn. 
(Style 1?) 
* 
‘Culm slender, leafy, terminating in a compounded — 
racemose appressed panicle. Calix persistent, as in 
Agrostis, but extremely minute; like an obtuse unequally 
bifid scale in the M. diffuse; in the M. erecta one of the 
valves is rather long and acute, according to the obser- z 
