GRAMINA. 73 
them. Caryops downy at the apex or glabrous, with or without a 
furrow on the inner face. 
The derivation of the name of this genus of grasses is from aveo, to desire, because 
cattle are fond of it. 
Sub-Genus I— TRISETUM. Pers. 
Perennial. Spikelets small, compressed. Glumes subscarious, 1- to 
3-nerved. Lower pale permanently membranous, keeled, awned. 
Caryops subcylindrical, not furrowed, usually glabrous. 
SPECIES I.— A VENA PLAVESCENS. Lhm. 
Plate MDCCXXXVI. 
Beicl. Ic. Fl. Germ, et Helv. Vol. I. Tab. CII. Figs. 204 to 206. 
Billot, Fl. Gall, et Germ. Exsicc. No. 1374. 
Trisetum flavescens, Pal. de Beauv. Bah. Man. Brit. Bot. ed. vi. p. 410. Kunth, 
Enum. Plant. Vol. 1. p. 298. Fries, Summ. Veg. Scand. p. 78. Oi-en. & Godr. 
Fl. de Fr. Vol. HI. p. 523. Crep. Man. Fl. Belg. ed. ii. p. 344. Pari. Fl. Ital. 
Vol. I. p. 260. Bumorf. Agrost. Belg. p. 122. 
T. pratense, Pers. Syn. Plant. Vol. 1. p. 97. 
Perennial. Rootstock shortly creeping, stoloniferous. Stems rather 
few in each tuft, glabrous, with pubescent knots. Leaves linear, 
flaccid, thin, with numerous slender slightly raised ribs, pubescent 
above, but scarcely so beneath, green; lower sheaths pubescent, the 
upper ones nearly glabrous ; ligule very short, truncate. Panicle 
erect, equal, open during flowering, loosely closed afterwards, when it 
becomes cylindrical, lobed and dense; panicle-branches numerous, 
slender, rough, the shorter ones of each node of the rachis with 
spikelets nearly to the base. Pedicels shorter than the spikelets, 
except the temoinal ones, which usually exceed them. Spikelets erect, 
very numerous, at first linear-elliptical, afterwards narrowly oblong- 
wedgeshaped, 3- to 6-flowered, shining, pale green, rarely with violet 
markings, ultimately yellowish-olive. Glumes very unequal, rough 
on the keel, acuminate, the lower one about half as long as the florets 
and 1-nerved, the upper one nearly as long as the florets and 3-nerved. 
Lower pale rather suddenly acuminated, terminated by 2 setje, per- 
manently scarious throughout. Awn from about one-third below the 
apex of the pale, that of the lowest floret nearly twice as long as the 
upper glume. Axis hairy between the florets, which, however, have 
not hairs at their base. 
On dry pastures, banks, and waste places. Rather common. 
VOL. XI. L 
