TRIANDRIA. DIGYNIA, — Pe) 
hed to Cenchrus, and furnished with «spiny involucrum.) —__ 
2. levigatum,, Eu. Seglaucum. 4. viride, 5. verticillatum. 
(These two'last.appear to have been introduced.) 6. cor- 
rugatum. 7. Italicum. (‘Yhis species is supposed to,be the 
true Panicum of the ancients, and its drooping panicle is 
described by Pliny, who speaks of it as not so much used 
as the Millet (Panicum miliaceum) in making bread, but — 
weighing-more than any other grain, as well as increasing : 
more in bulk when cooked. It is still cultivated in Italy 
and other parts of Europe, and from the vast size of its 
spike must be very productive. Mr. Elliott remarks, that 
in Carolina it sometimes attains the height of 10 feet. Of 
thig genus, though not numerous, there are species in 
Europe, India, the West Indies, Africa, andNew Holland. 
81. ORTHOPOGON. Mr. R. Brown. 
Calix 1-flowered, with 3 nearly equal valves, 
all awned, the awn of: the exterior valve much 
longer than the others; awns straight, and 
smooth, 3 
With the exception of the present species, these are 
tropical grasses, growing in shady places. Their leaves 
fiat, and broadish. Spike composed of alternate spikelets 
directed all one way, and sometimes consisting of very _ 
few flowers. 
Species. 1. 0. hirtellum. (Panicum hirtellun:, Lin.) In 
Florida and South Carolina. In this species, as it appears 
in the United States, the spikelets contain from 5 to 8 
flowers, the partial and general rachis often smooth as 
well as villous, sometimes the valves of the calix are mul- 
tiplied to 4,of which the external ones whether above or 
below are furnished with very long, smooth, straight, and 
viscid awns; the neutral rudiment at the base of the inner ss 
valve of the indurated perfect flower is very minute znd 
bifid, constantly attended with an oblique and imperfect = 
lateral valve, ciliate at the upper edge as areallthe valves 
of the calix, whether the other pubescence be present or 
not. Of this genus Mr. Brown describes 4 species in 
New Holland, the P. compositum of Ceylon as well as the 
present plant are also included in this genus by its foun- 
der, and there appears to be some other species in India _ 
and the West India islands. oe 
82, DIGITARIA. Haller. Richard. (Crab-grass.) 
Calix 2 or 3-valved, concave; exterior valve 
minute, or none, second Variable, the innermost 
