60 



CLASS XVIII ORDER L 



ked ; egret simple, hairy ; florets of the ray 

 yellow, often destitute of anthers. 



Sene'cio. Calyx sub-cylindric, equal, 

 scaly at the base ; scales withered at the 

 points ; receptacle naked ; egi-ct simple ; 

 rays sometimes wanting, (iire-weed.) 



Cinera'ria. Involucre simple, many- 

 leaved, equal ; egret .simple. 



Bolto'nia. Calyx imbricate ; rays nu- 

 merous ; receptacle conic, punctate ; seeds 

 flat; egi-et consisting of minute bristles, 

 with 2 elongated and opposite bristles, 

 (false chamomile.) 



Chrysop"sis. Calyx imbricated; ray- 

 florets mostly yellow ; receptacle naked ; 

 egi'et double, outer one chaffy, minute, in- 

 ner one scabrous, many-rayed. iS. 



Dah"lia. Receptacle chaffy ; egret none; 

 calyx double, outer one many-lcavcd, inner 

 one 1 -leaved, 8-parted. Ex. 



[Receptacle chaffy or hairy.] 



A.\'"thkmis. Calyx hemi-spherical; scales 

 with scarious margin.s, nearly equal ; egi-et 

 0, or a membranous margin ; florets of the 

 ray more than 5 ; receptacle chaffs flat, with 

 a rigid, acuminate apex ; seed crowned 

 with a membranous border or egi-et. (may- 

 weed, chamomile.) 



Achille'a. Calyx imbricate, ovate, un- 

 equal ; egi-et 0; florets of the ray 5 to 10, 

 roundish, dilated ; flowers corymbed. (yar- 

 row.) 



_ Heliop^'sis. Calyx imbricate, with ovate- 

 linear lined scales; ray-florets linear, large; 

 receptacle chaffy, conic ; the chaffs lanceo- 

 late ; seeds 4-sided ; egi-et 0. (sun-ray.) 



Hele'nium. Calyx 1-leafcd, many-part- 

 ed ; egret 5-awned, chaffy leaves ; recepta- 

 cle globose, naked in the' disk, and chaffy 

 in the ray only ; florets of the ray half 3- 

 cleft ; seed viUose ; leaves decun-ent. (false 

 sunflower.) 



_ Verbesi'na. Calyx many -leaved ; leafets 

 dispo.sed in a double series ; rays about 5 ; 

 receptacle chaffy; egret awned. (crown- 

 beard.) 



EcLip'^TA. Involucram many-leaved, the 

 leaves nearly equal ; florets of the disk 4- 

 cleft ; egret none ; receptacle bri.stly. S. 



Sieoesbec"kia. Outer involucrum 5- 

 leaved, spreading, inner one many-leaved, 

 5-angled, nearly equal ; rays only on one 

 side of the flower ; receptacle chatty; egret 

 ; akenes somewhat 4 -sided. S. I 



Zin"nia. Calyx ovate, cylindric ; rays 5, ! 

 entire, permanent ; receptacle chaffy ; egret 

 2, erect awns, (blood maiygold.) S. 



order hi. polygamia frustrania. 



He'lian"thus. Calyx imbricate, sub- 

 equan-ose, leafy; receptacle flat, chafly ; 

 egret 2-lcaved, chaff like, caducous, (sun- 

 flower, Jerusalem artichoke.) 



Rudbeck^ia. Calyx consisting of a dou- 

 ble series of leafets or scales; receptacle 

 chalFy, conic ; egret a 4-toothed margin, or 0. 

 (cone-flower.) 



B I'd ens. Calyx sub-equal, leafy or scaly 

 h\ t lie base; rav."^ often wanting ; receptacle 



chaffy, flat; egret of 2 or 4 awns, seed 

 quadrangular. (buiT-marv^gr]d.) 



CoK£op"sis. Calyx double, each series 

 many-leaved, the interior equal and colored, 

 receptacle chaffy ; scales flat ; seed com- 

 pressed, emarginate. (S^. 



Centau"rea. Calyx variou.s, mostly im- 

 bricate, roundi.sh; e.gi'et simple, various; 

 receptacle bristly ; corollas of the ray fun- 

 nel-shape, longer, in-egular. (blue-bottle, 

 bles.sed thistle.) Ex. 



Lep^'topo'ba. Involucrum simple, many 

 parted ; rays 20 or more, 3 -cleft, widening 

 at the top ; receptacle naked, hemispheri- 

 \ cal ; egret consists of 8 to 10 awnless, chaff- 

 j like valves. S. 



Galar'^dia. Involucre many-leaved, flat, 

 ' sub-equal ; rays 3-cleft, widening toward 

 j the top ; receptacle bristly, hemispherical ; 

 i egret chaffy ; leafets 8 to 10, awned. S. 

 i Acti.nome'ris. Calyx simple, many- 

 ; leaved, foliaceou.s, sub-equal, remote, elon- 

 I gated, 4 to 8 ; receptacle small, chaffy ; seed 

 compressed ; margin crowned with 2 per 

 sistent awns. 



ORDER IV. POLYGAMIA KECESSARIA. 



Calen"dula, Calyx many-leaved, equal ; 

 receptacle naked ; egret none ; seeds of the 



j disk membranaceous, (pot marygold.) Ex. 



I SiLPH^'iUM. Calyx squarrose, scales 

 broad and leafy ; receptacle chaffy ; seed 

 flat, ob cordate, emarginate, bideutate. 



! Polym"nia. Calyx double, exterior 4 to 

 5-leaved, interior 10-leaved ; leafets con 

 cave ; receptacle chaffy ; egret 0. 



I Gymnosty'les. . Involucre many-leaved, 



i the leafets in a single series ; pistillate flor- 



j ets, apetalous ; akenes compressed, some- 

 what toothed at the sunmiit, awned witli 

 the permanent styles. S. 



j Parthe'nium. Involucrum 5-leaved; 

 raj's veiy small ; receptacle chaffy, minute ; 

 outer scales dilated ; akenes obovate, mi- 

 nutely 3-awned. 



I'VA. Calyx about 5-pai*ted ; florets of the 

 ray 5 ; receptacle having seeds obovate, na- 

 ked, (high-water shrub.) 

 Chhy^'sogo'num. Involucre 5-leaved ; re- 

 ceptacle chaffy ; egret 1-leaved, 3-toothed , 

 akenes suiTounded by a 4-leaved calycle. <S^. 



ORDER V. POLYGAMIA SEGREGATA. 



Elephanto'pus. Partial calyx 4-flow- 

 ered ; florets 5-cleft, hgulate, perfect ; recep- 

 tacle Jiaked ; dovsTi setaceous, (elephant 

 foot.) 



EcHi'xoPS. Proper calyx 1-flowered 

 corolla perfect, tubulai- ; receptacle setose 

 (globe-thistle.) Ex. 



CLASS XVIIL GYNANDRIA. 



ORDER I. MONANDRIA. 



A. Anthers adnate, suh-terminal, not ca 

 ducous ; masses of pollen affixed hy the 

 base, and made up oj angular particles. 



Or"chis. Corolla ringeutlikc, upper pe- 

 tal vaulted ; hp dilated, spurred beneath ; 

 masses of pollen 2, adnate, terminal, (or 

 chis.) 



