CLASS IV. ORDER I. 
343 
ghorter than the flofets, with one large 
glume, keeled, pointed; corolla with tlie 
lower valve keeled, emarginate, mucro- 
nate, upper valve sub-conduplicate. (or- 
chard-grass.) 
Kcele'ria. Glume 2 to 4-flowered,8hort- 
er than the florets ; lower palea mucronate, 
or with a short bristle a little below the tip. 
Fkstu'ca. Spikelets oblong, more or less 
terete, at length compressed, acute at each 
end ; florets sub-terete ; glumes unequal, 
shorter than the lower florets, keeled, 
acute ; paleas lanceolate, the lower one 
acuminate or rounded at the extremity, 
(fescue-grass.) 
Buo'mus. Glumes 2, shorter than the flo- 
rets ; spikelets terete, 2-ranked, many-flow- 
ered ; outer paleas bifid, awned below the 
tip, inner owe pectinate-ciliate, sub-condu- 
plicate. (chess, broom-grass.) 
Dantho'nia. Glumes 2 to 5-flowered, 
longer than the florets, cuspidate ; palea, 
bearded at the base, lower one 2-toothed, 
with a twisted awn between the teeth, 
upper one obtuse, entire ; panicle spiked, 
(wild-oats.) 
Ai'ra. Glumes 2, rarely 3-flowered, 
beardless, 2-valved, equal to the florets, or 
shorter ; one of the florets peduncled ; pa- 
leas 2, equal, enclosing the seed when 
ripe, outer one usually awned ; panicle 
compound. 
Ave'na. Calyx 2-valved ; 2, 3, or many- 
flowered; corolla with valves mostly 
bearded at the base, lower one torn, with 
a twi.sted awn on the back ; glumes mem- 
branaceous, and somewhat follicle-like ; 
seed coated, (oats.) Ex. 
[Flowers in spikes. '\ 
Lo'lium. Calyx 1-leafed, permanent, 
many-flowered ; florets in many-flowered, 
2-rowed, simple, sessile spikelets on a ra- 
chis, lower valve of the corolla herba- 
ceous-membranaceous, mucronate, or bris- 
tled at the tip. (darnel-grass.) 
Trit"icum. Calyx 2-valved, about 3- 
flowered ; florets sessile on the teeth of the 
rachis, obtusish and pointed ; glumes beard- 
less, or interruptedly bearded, (wheat.) 
Ex. 
Sesle'ria. Glumes 2 to 5-flowered ; pa- 
leas 2 ; stigmas sub-glandular ; base of the 
spike bracted or involucred. (moor-grass.) 
S. 
Meli'ca. Glumes unequal, 2 to 5-flower- 
ed, membranaceous, nearly as long as the 
florets, of which the upper are incomplete 
and abortive; scales truncate, fimbriate; 
seed loose, not furrowed ; panicle simple 
or compound, (raelic-grass.) 
Seca'le. Calyx 2-valved, 2 or 3-flowered ; 
«pikelets sessile on the teeth of the rachis, 
with the terminal floret abortive ; calyx 2- 
vaJved ; glumes subulate, opposite, shorter 
than the florets; corolla with the lower 
alve long awned. (rye.) Ex. 
Flowers polygamous. {In panicles.] 
Pan"icum. Calyx 2-valved, 2-flowered ; 
lower glume generally very small ; the 
lower floret abortive, 1 or S valved, the 
j lower valve resembling the calyx, the up- 
I per one membranaceous ; perfect floref 
with cartilaginous valves, unarmed, (cock- 
foot grass, panic-grass.) 
Hoi/'cus. Glumes 2-valved, 2-flowered, 
nearly equal ; paleas 2 ; florets dissimilar, 
polygamous, one awned, the other awnless, 
without any imperfect one between them; 
panicles contracted. 
[In spikes.] 
Hor"deum. Spikelets 3 at each joint of 
the rachis, 1 or 2-flowered, all perfect, or the 
lateral ones abortive ; glume lateral, subu- 
late ; perfect flower with a 2-valved corol- 
la, lower valve ending in a bristle ; seed 
coated, (barley.) Ex. 
Androp"ogon. Spikelets in pairs, invo- 
lucred, the lower one staminate or neuti'al, 
on a bearded pedicel ; glumes and paleaa 
often vei-y minute, or wanting ; upper spike 
lets sessile, 1-tiowered, perfect ; glumes sub- 
coriaceous ; paleas 2, shorter than the glumes, 
membranaceous, lower valve generally awn- 
ed. (beard-grass.) 
Pennise'tum. Inflorescence, a compound 
cylindrical spike ; spikelets 2-flowei'ed, in- 
vested with an involucrum of 2 or more 
bri.stles ; glumes 2, unequal, herbaceous ; 
superior florets perfect; paleas caitilaginous. 
(bristled panic.) 
Kotbol''lia. Rachis jointed, somewhat 
terete, often filiform; calyx ovate-lanceo- 
late, flat, 1 or 2-valved, 1 or 2-flowered ; flo- 
rets alternate on a flexuous rachis. S. 
Monoce'ra. Flowers in 2 rows on one 
side of the rachis ; glumes 3, many-flowered, 
valves awned below the tip. Peifect flow- 
ers have 2 paleas, unequal, outer valve 
awned below the tip. Neutral flowers have 
2 awnless paleas. S. 
ORDER III. TRIGYNIA. 
Mollu'go. Calyx 5-leaved, colored with- 
in ; corolla 0 ; capsule 3-celled, 3-valved. 
(carpet-weed.) 
Leche'a. Calyx 3-sepalled; petals 3, 
linear; stigmas 3, plumose ; capsule 3-celled, 
3-valved, with 3 inner valvelets ; seed 1. 
Mon"tia. Calyx 2 to 3-sepalled ; petals 5, 
sub-connate at the base, 3 rather small ; sta- 
mens on the claws of the petals, mostly be- 
fore the 3 smallest ; styles short, reflexed ; 
capsules 1 -celled, 3-valved, 3-seeded. 
Polycak"pon. Calyx 5-sepalled : petal* 
5, very short, emarginate, peraianent ; cap- 
sule ovate, 1-celled, 3-valved. S. 
Prosekpina'ca. Calyx 3-parted, superi- 
or ; corolla 0 ; fruit a hard nut, 3-sided, 3- 
seeded, crowned by the calyx, (memiaid- 
weed.) 
CLASS IV. TETRANDRIA. 
ORDER I. MONOGYNIA. 
A. Flowers superior, [l-petalled.] 
Allio'nia. Common calyx oblong, sim- 
ple, 3-flowered, proper calyx obsolete ; co 
roUa irregular ; receptacle naktul. 
Cephalan''thus. InllorcsctMico in a 
head; general calyx iione, fniper eftlv:^ 
