62 
CLASS XVIII. ORDER L 
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.) 
Aciiille'a. Calyx imbricate, ovate unequal; egret 0; florets of the ray 5 to 
10, roundish, dilated ; flowers corytnbed. (yarrow.) 
Heliop^sio. Calyx imbricate, with ovate linear lined scales; ray-fiorets lin¬ 
ear, large; receptacle chaffy, conic; the chaffs lanceolate ; seeds 4-sided; egret 0. 
(sun-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; seedviliose; leaves decurrent, (false sunflower.) 
Verbesi'na. 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 marygold.) $. 
ORDER III. POLYGAMIA FRUSTRANIA. 
HelianVthus. 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, fiat; egret of 2 or 4 awns ; seed quadrangular, (burr mary¬ 
gold.) 
Coreopsis. 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¬ 
ous; receptacle bristly ; corollas of the ray, funnel-shape, ionger, irregular, 
(blue-bottle, blessed thistle.) Ex. 
Actinome'ris. 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. 
Calendula. 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. 
Pol ym // nia. Calyx double, exterior 4 to 5-leaved ; interior 10-leaved ; leafets 
concave ; receptacle chaffy; egret 0. 
Eva. Calyx about 5-parted; florets of the ray 5; receptacle having seeds 
obovate, naked, (high-water shrub.) 
ORDER V. POLYGAMIA SEGREGATA. 
Elephan"topus. Partial calyx 4-fiowered; 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 XVIII. GYNANDRIA. 
ORDER I. MONANDRIA. 
A. Anthers adnate , sub-terminal , not caducous; masses of 'pollen affixed by the 
base y and made up of angular particles. 
Or^chis. 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 
summit of the stigma , and made up of farinaceous or angular particles. 
Goodye/ra. Corolla ringeiit-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. 
