CLASS IV. ORDER I. 
37 
eliorter than the florets, witli one large 
plume, keeled, pointed; corolla with the 
iovN'er valve keeled, emarginate. mucro- 
v.file, upper valve sub-conduplicate. (or- 
chiird-grass.) 
Kcele'ria. Glume 2 to 4 -flowered.short- 
er than the florets ; lower palea mucronate, 
or with a short bristle a little below the tip. 
JfKSTU'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.) 
Bro'mus. Glumes 2, shorter than the flo- 
rets ; spikelets terete, 2-ranked, many-flow- 
ered; outer paleas bifid, awned below the 
tip, inner one 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. 
Avk'na. Calyx 2-valved ; 2, 3, or many- 
flowered ; corolla with valves mcstly 
bearded at the base, lower one torn, with 
a twisted awn on the back ; glumes mem- 
branaceous, and somewhat foUicIe like ; 
Beed coate3. (oats.) Ex. 
[Flotvers 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-gra.ss.) 
Trit"icum. Calyx 2-valved, about 3- 
flowered ; florets sessile on the teeth of the 
rachis, obtusi.sh 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 ; 
eeed loose, not furrowed ; panicle simple 
or compound, (melic-grass.) 
Seca'le. Calyx 2-viilved, 2 or 3-flowered ; 
epikelets sessile on the teeth of the rachis, 
with the temiinal floret abortive ; calyx 2- 
valved; glumes subulate, opposite, shorter 
than the florets; corolla with the lower' 
valve long awned. (rye.) Ex. 
D. Flotcers polygamous. {In panicles.] 
Pan"icum. Calyx 2-valved, 2-flowered ; 
the lower glume generally very smiill ; the 
lower floret abortive, 1 or 2 valved , the 
lower valve resembling the calyx, the up- 
per one membranaceous; perfect floret 
with cai'tilaginous valves, unarmed, (cock- 
foot grass, panic- grass.) 
Hol'^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 peifect, 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 neutral, 
on a bearded pedicel ; glumes and paleaa 
often very minute, or wanting ; upper spike- 
lets- sessile, 1 -flowered, perfect ; glumes sub- 
coriaceous ; paleas 2, shorter than the glumes, 
membranaceous, lower valve generally awn- 
ed. (beard gi-ass.) 
Pennise'tum. Inflorescence, a compound 
cylindrical spike ; spikelets 2-flowered, in- 
vested with an involucrum of 2 or more 
bristles ; glumes 2, unequal, herbaceous ; 
superior florets perfect ; paleas cartilaginous, 
(bristled panic.) 
RoTBOL^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. Perfect flow- 
ers have 2 paleas, unequal, outer valve 
awned below the tip. Neutral flowers have 
2 awnless paleas. S. 
ORDER 111. 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 ; 
cap.-^ules 1-celled, 3-valved, 3-seeded. 
PoLYCAR^PON. Calyx 5-sepalled; petals 
5, very short, emarginate, pennanent ; cap- 
sule ovate, 1-celled, 3-valved. S- 
Proserpina'ca. Calyx 3-parted, superi- 
or ; corolla 0 ; fruit a hard nut, 3-sided, 3- 
seeded, crowned by the calyx, (mermaid- 
weed.) 
CLASS IV. TETRANDRIA. 
order I. MONOGYNIA. 
A. Floioers superior, [l-petalled.] 
Allto'nia. Common calyx oblong, sim- 
ple, 3-flowered, proper calyx obsolete ; co- 
rolla iiTCgular ; receptacle naked. 
Cephai,an''thus. Infloreffcence in a 
head ; general calyx none, proper oalyH 
