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- TRIANDRIA. DIGYNIA. 71 
From Danthonia of Decandolle, (Festuca dec ns, 
Lin.) it is scarcely distingishable except by hab — pro- 
_ ducing in both species a spreading and ramified panicle, 
with a culm of 3 or 4 feet elevation, in place of a simple . 
raceme, and a culm of 6 inches or a foot, it is aiso desti- — 
tute of the large folliculose calix of Danthoma, whichin- 
cludes, and indeed exceeds in length all the fléscu- — 
li of the spikelet. he cal\x of Wiudsoria is, however, 
larger than the glumes of tne coroila, taken singly, and 
aisv of a very different structure, but the spikelet is at 
the same time about twice ihe lengih of the calix. 
100. DANTHONIA,. Decandolle. 
Calix 2-vaived, many flowere” very large, 
equal to or exceeding the in cuded spikelet. — 
Exterior valve of the corolla concaye, with the 
points emarginate, mucronate, awned, or un- 
armed and then trifid, 
Small grasses, producing for the most part, a simple 
raceme of spikelets, (usually from 4 to 13); calix conflu- 
enuy nerved, foiliculose, exceeding or-equaling the spike. 
le(; spiculi from. 4 to 9 Soutred: ascae valve acute or 
acuminate, (not obtuse or almost tryncated as in Wind- 
soria,) bifid, with a central, membfanaceous, and fiat- 
tened awn, contorted at the base, br simply trifid, (ne- 
ver quadrifid or 5-toothed); inner valve ciliate. 
Species. 1. D. spicata, (Avena spicata, L.) Culm abouta 
foot high, slender, erect, decumbent at the first and second 
node; leaves subulate, short, those of the root often hairy 
on the upper surtace; stipula obsolete, cihate; raceme 
simple, or subdivided near the base; spikelets 4 to 9; calix 
longer than the spikelet, confluently S-nerved, convex, — 
acute, with scariose purple maryins; fluscuh 6 or 7; ower — 
valve oval, convex, acuminate, setaceously bifid, with an — 
intermediate, flat, exserted, smooth awn, discoloured and 
concorted at its base, obsoletely,many-nerved, nerves pili- 
_ferous, margin scariose; inner vaive deeply appressed, cr- 
liate, styles sessile, simply plumose, s > white; pe- 
_ Fisporium 2-leaved, obtuse. eee ae ; 
Tisis species is very nearly allied to Bromus. 
2. *sericea. Culm erect; raceme compounded, branc 
2 and 3-fowered; spikelets 9 to 13, 8 and 9-flow 
‘somewhat shorter than the Calix; corolla valves 
equal, outer lanceolate, densely villous on 
‘setosely bifid at the point, with a central 
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