GRAJHNA. 
No wonder, then, that weight should be made a test of qnalitj. 
We conclude, then, that the A. strigosa, A. fatua, and A. sativa are, to say the least, 
The use of the wild oat, with its brown hairy seed and twisted awn, as an artificial 
These awns also make excellent hygrometers, being very sensitive to the humidity 
of the atmosphere, which causes them to expand ; and during dry weather they 
Sub-Gentjs IY— ARRHENATHERUM. Pal de Beauv. 
Perennial. Spikelets erect, rather large, slightly compressed. 
Glumes subherbaceous, 1- to 3-nerved. Lower floret usually male. 
Lower pale subherbaceous, ultimately parchment-like, keeled, con- 
spicuously awned in the lower floret, but very shortly so in the upper 
one. Caryops elliptical, dorsally compressed with a furrow on the 
inner face, pubescent at the apex. 
The name of this genus of grasses is derived from the words appriv, male, and adi'ip, 
SPECIES VI.— A VENA E L A T I O B. Linn. 
Plate MDCCXLIL 
EeicTi. Ic. El. Germ, et Helv. Vol. I. Tab. XCVQI. Figs. 192 and 193. 
Arrhenathemm elatius, 3Iert. & Koch. Koch, Syn. Fl. Germ, et Helv. ed. ii. p. 916. 
Gmi. & Godr. Fl. de Fr. Vol. HI. p. 520. Pari. Fl. Ital. Vol. I. p. 293. Crej,. 
Man. Fl. Belg. ed. ii. p. 344. 
A. avenaceum. Pal. de Beam. Bab. Man. Brit. Bot.\ ed. vi. p. 411. Hooh & Am. 
Brit. Fl. ed. viii. p. 544. Kiinth, Enum. Plant. Vol. I. p. 307. Beich, Ic. I e. 
p. 19. 
Holcus avenaceus, Scojf. Sm. Engl. Bot. ed. i. No. 813. 
Perennial. Rootstock extensively creeping, without radical leaves, 
but producing numerous flowering and barren stems. Leaves broadly 
linear, flaccid, thin, flat, with numerous slender rather rough ribs, 
every fourth or fifth of which is stronger than the others, deep green ; 
sheaths smooth ; ligule short, lacerate. Panicle erect, or sometimes 
slightly drooping at the apex, lax, spreading in all directions during 
flowering, closed before and afterwards. Pedicels rough, mostly 
shorter than the spikelets. Spikelets erect, numerous, opening widely 
only during flowering, :2 -flowered, with the lower flower male, and 
the upper one perfect, pale green, sometimes tinged with very pale 
VOL. XI. M 
