CLASS XVII. ORDER II. 



59 



Ste > *A. Receptacle naked ; egret cliafF- 

 l)ristlco involucre cylindric, from a simp'le 

 series o'^^eafets. >S'. 



Bkick ri.'^LiA. Receptacle naked, dotted ; 

 egret ha^.y or scabrous ; akenes nearly gla- 

 brous, 10 streaked ; involucre many-leaved, 

 imbricate. S. 



C. Florets tuhulous ; flower discoid. 



Eltpato'kium. Calyx imbricated (rarely 

 simple), oblonir ; style lone;-, cloven half way 

 down ; egrot pilose, scabrous, or roui?b pa- 

 pillose ; receptacle naked ; eeed smooth and 

 glandular, 5-striate. (boncsct, thorough- 

 wort, joepye.) 



Mika'nia. Calyx 4-6-leaved, 4-6-flowcr- 

 sA ; receptacle naked ; egret pilose. 



Kuh'nia. Calyx imbricate, cylindric; re- 

 ceptacle naked ; egret plumose, sessile ; 

 ieed pubescent, striate, (false bonesct.) 



Polyp^'teris. Involucrum many-leaved, 

 leaves oval ; egret chafl'y, many-leaved, the 

 chatr broad-subulate, cuspidate, rigid, as 

 iong as the seed. 



Chrvsoco'ma, Calyx imbricate, oblong; 

 receptacle naked ; egi'et haiiy, scabrous ; 

 5eed puDescent. (golden-locks.) 



Caca'lia. Calyx cylindric, scaly at the 

 base , receptacle naked ; egret haiiy. (wild- 

 -■laraway.) 



Sparganoph'^orus. Calyx sub-globose, 

 imbricate ; scales secured at the point ; re- 

 ceptacle naked ; seed crowned with a car- 

 tilaginous, shining cup (water-crown-cup.) 



s. 



Marshal'^lia. Involiicrum imbricate; 

 scales sub-lanceo!iate, incumbent ; recepta- 

 cle chafiy ; egi'et 5, membranaceous, acu- 

 minate ; nerveless scales. 



Melananthk'ra. Involucrum imbri- 

 cate ; leafets ovate, close-pressed, sub-equal; 

 receptacle chaffy ; scales keeled, the lower 

 part embracing the florets ; egret consisting 

 of 4 or 5 unequal, unarined awns. 



Santoh'na. Calyx imbricate, hemi- 

 spherical ; scales keeled, with scarious 

 points. iS. 



xVgera'tum. Egret with ^ somewhat 

 awned jscales ; leaves of the calyx oblong, 

 in a double row ; corolla 4 or 5-cleft ; recep- 

 tacle naked. Ex. 



order II. POLYGAMIA SUPERFLUA. 



A. Flowers discoid ; the ray-jlorcts being 

 obsolete. 



Tanace'tum. Calyx imbricate, hemi- 

 spheric ; scales acuminate ; rays obsolete, 

 3-clelt ; egret somewhat marginal ; recepta- 

 cle naked ; flowers coiymbed. (tansey.) 



Artemi'sia. Calyx imbricate, ovate, with 

 scales rounded, converging ; ray-florets sub- 

 ulate ; egret ; receptacle somewhat vil- 

 lose, or nakedish ; flowers mostly rounded, 

 (wormwood, southern-wood.) S. 



Gxapha'lium. Calyx imbricate, with the 

 marginal scales rounded, scarious, shortish, 

 glossy, colored ; receptacle naked ; egret 

 pilose or jjlumo-'se, scabrous ; florets of the 

 ray subulate, of tlie disk entire. Sometimes 

 all the florets are perfect, (life everlastino:.) 



Cony'za. Involucre imbricate, the scales 



appres.sed ; receptacle naked ; marginal flo- 

 rets fertile, 3-cleft ; egret simple, capillary , 

 acines hairy. 



Bac"chakis. Calyx imbricate, cylindric; 

 scales ovate, sub-coriaceous ; fertile florets 

 mixed with the perfect ; recoptarcle naked ; 

 egret hairy, (gi-oundsel-tree.) 



Pterocau'lon. Involucre imbricate, 

 with close-pressed, downy, sub-scarious 

 scales ; receptacle naked ; perfect and pis- 

 tillate florets intermixed, tlie pistillate ones 

 slender, border 3-toothed, periiect ones with 

 a 5-cleft border ; egret haiiy, scabrous . 

 akenes angled, haiiy. S. 



B . Floicers radiate ; the lignlate roy florets 

 very manifei^t. {Receptacle 7iakcd.] 



Eri'geron. Calyx imbricate, sub-hemi- 

 spherical ; florets of the ray very numeron.q 

 and nalT0^v ; egi"et double, outer minute, 

 inner hairy, of fc^v rays. 



Lnu'la. Calyx imbricate, generally squar 

 rose ; egi'et simple, scabrous, sometimes a 

 minute, exterior, chatty one ; anthers ending 

 in 2 bristles at the base ; ray-florets numer- 

 ous, alvs'ays yellow, (elecampane.) 



As"ter. Calyx imbricate, the inferior 

 scales generally spreading ; egi-et simple 

 pilo.se ; receptacle often deep-pitted ; florets 

 of the ray more than 10, except in a few . 

 species ; color purple or white, never yel- 

 low, (star-flower.) 



Solida'go. Calyx oblong or subcylin- 

 dric, ■with oblong, narrow, pointed, straight 

 scales, imbricate, clo.«ed upon the flower ; 

 ray-florets about 5, and fewer than 10, lan- 

 ceolate, 2-tootlied, equal to, or shorter than 

 the calyx ; filaments capillarj% veiy short ; 

 style thread-form, equalling the length of the 

 stamens; stigma-clelt, spreading ; egret sim- 

 ple, pilose, scabrous ; receptacle furrowed 

 with dots or punctures ; seeds oblong, ovate ; 

 yellow, (golden-rod.) 



Tussii.a'go. Calyx simple, swelling, 

 scales equal, and e(jualling the di.sk, sub- 

 membranous ; pistillate florets ligulate or 

 without teeth ; egret simple, sessile; some- 

 times polygamous, (colt's-foot.) 



Chrysan^'themum. CaljTc hemispheri- 

 cal, imbricate, wdth the scales membranous 

 at the margin ; egret none, or a nanow mar- 

 gin, (ox-eyed daisy, fever-few.) 



Bel'^lis. Calyx hemispherical; scales 

 equal ; egret ; receptacle conical ; seed 

 ovate, (garden dai.sy.) Ex. 



Tage'tes. Calyx simple, 1-leafed, 5- 

 toothed, tubular ; florets of the ray about 5 

 permanent; egret 5 erect awns, (maiy 

 gold.) Ex. 



Matrica'ria. Involucre flat, imbricate, 

 with scales having scarious margins ; recep- 

 tacle naked, terete ; egret none. Ex. 



Tri'cu'phyl"lum. Involucre oblong-cyl- 

 indric, many-leaved, equal ; ray-florets ob- 

 long ; receptacle naked ; egret chatty, mi- 

 nute, 5 to 8-Ieaved ; leafets obtuse, awuless. 

 S. 



Pec''tis. Involucrum 5-leaved; raj'-flo- 

 rets 5 ; receptacle naked ; egret 3-5 awns. 



Arni'ca. Calyx hemispheric.'!!. Ifilits 

 equal, longer than the disk ; receptac'e na 



