62 
CLASS XVIII. ORDER I. 
equal ; egret 0, or a membranous margin ; florets of the ray more than 5 ; recep- 
tacle chaffs flat, with a rigid, acuminate apex ; seed crowned with a membra- 
nous border or egret, (may-weed, chamomile.) 
Achille'a. Calyx imbricate, ovate unequal ; egret 0; florets of the ray 5 to 
10, roundish, dilated ; flowers corymbed. (yarrow.) 
Heliop'^sis. Calyx imbricate, with ovate linear lined scales; ray-florets lin- 
ear, large; receptacle chaffy, conic; the chaffs lanceolate ; seeds 4-sided ; egret 0. 
(sim-ray.) 
Hele'nium. Calyx 1-leafed, many-parted ; egret 5-awned, chaffy leaves ; re- 
ceptacle globose, naked in the disk, and chaffy in the ray only ; florets of the 
ray half 3-cleft ; seed villose ; leaves decurrent"! (false sunflower.) 
VerbesiW, Calyx many-leaved; leafets disposed in a double series; rays 
about 5; receptacle chaffy ; egret awned. (crown-beard.) 
ZiN^^NiA. Calyx ovate, cylindric; rays 5, entire, permanent; receptacle 
chaffy ; egret 2, erect awns, (blood mary gold.) S. 
ORDER III. POLYGAMIA FRDSTRANIA. 
Helian'^thus, Calyx imbricate, sub-squarrose, leafy ; receptacle flat, chaffy ; 
egret 2-leaved, chaff'-like, caducous, (sunflower, Jerusalem artichoke.) 
Rud'^beckia. Calyx consisting of a double series of leafets or scales; recep- 
tacle chaffy, conic ; egret a 4-toothed margin, or 0. (cone-flower.) 
Bi'DENs. Calyx sub-equal, leafy or scaly at the base ; rays often wanting ; 
receptacle chaffy, flat ; egret of 2 or 4 awns ; seed quadrangular, (burr mary- 
gold.) • 
CoREOP^sis. Calyx double; each series many-leaved; the interior equal and 
coloured; receptacle chaffy ; scales flat; seed compressed, emarginate. <S'. 
Centau'^rea. Calyx various, mostly imbricate, roundish ; egret simple, vari- 
otis ; receptacle bristly ; corollas of the ray, funnel-shape, longer, irregular, 
(blue-bottle, blessed thistle.) Ex. 
Actinome'bis. Calyx simple, many-leaved, foliaceous, sub-equal, remote, 
elongated, 4 to 8; receptacle small, chaffy; seed compressed ; margin crowned 
with 2 persistent awns. 
ORDER IV. POLYGAMIA NECESSARIA. 
Calen'^dula, Calyx many-leaved, equal ; receptacle naked ; egret none ; 
seeds of the disk membranaceous, (pot marygold.) Ex, 
SiLPH'^iuM. Calyx squarrose, scales broad and leafy; receptacle chaffy ; seed 
flat, obcirdate, emarginate, bidentate. 
Polym'^nia. Calyx double, exterior 4 to 5-leaved ; interior 10-leaved; leafets 
concave ; receptacle chaffy ; egret 0. 
FvA. Calyx about 5-parted; florets of the ray 5; receptacle 'having seeds 
obovate, naked, (high-water shrub,) 
ORDER V. POLYGAMIA SEGREGATA. 
Elephan/'topds. Partial calyx 4-flowered ; florets 5-cleft, ligulate, perfect; 
receptacle naked; down setaceous, (elephant-foot.) 
Echi'nops. Proper calyx 1-flowered ; corolla perfect, tubular ; receptacle setose 
(globe-thistle.) Ex. 
CLASS XVin, GYNANDRIA. 
ORDER I. MONANDRIA. 
A, Anthers adnate, sub-terminal, not caducous ; masses of pollen affixed by the 
base, and made up of angular particles. 
Or"ciiis. Corolla ringent-like, upper petal vaulted ; lip dilated, spurred be- 
neath ; masses of pollen 2, adnate, terminal, (orchis ) 
Habena'ria, Corolla ringent ; lip spurred at the base beneath ; stipes of the 
pollinia with naked and distinct glands ; cells of the stalks adnate, or separated. 
B. Anther parallel with the stigma, not caducous ; masses of pollen affixed to the 
suminit of the stigma, and made up of farinaceous or angular particles. 
Goodye'ra. Corolla ringent-like, the lower petals placed under the gibbous 
lip, which is divided above ; style free ; constituent particles of the masses of 
pollen angular, (rattlesnake-leaf, scrophula weed.) 
Neott^'ia, Corolla ringent ; the 2 lower petals placed beneath the lip, which is 
beardless; interior petals converging; style wingless ; pollen farinaceous. 
