120 spring Flora of Ohio. 



. -1. Genus A-CH I L-LE'-A.— Heads nian3-flowered, radiate, rays few; 



I "^ invokicral scales imbricated, with scarious margins; receptacle chaffv; 

 / achenes flattened, oblong. 



A-chil-le'-a mil-le-fo'-li-um L. Yarrow: Milfoil. -^Leaves twice pin- 

 nately parted, the divisions linear, o-o-cleft, crowded ; corymb of 

 heads compound. 



5. Genus AN'-THE-MIS. — Heads many-flowered, radiate ; involucre 

 hemispherical, of many small imbricated, dry and scarious scales ; 

 receptacle conical, without chaff near the margin. 



An'-the-mis cot'-u-la L. May-weed; Dog-fennel. — Leaves finelv .'i-pin- 

 uately dissected ; plants ill-scented. 



I>. Genus CHRY-SAN'-THE-MUM. — Rays numerous; involucre I)road 

 and flat, the scales with scarious margins, imbricated; receptacle 

 naked ; disk-corollas flattened ; achenes striate ; pappus none. 



Chry-san'-the-mum leu-can'-the-mum L. Ox-eye Daisy: White-Weed. — 



Stem erect nearly simple, naked above, bearing a single large head. 



7. Genus TUS-SI-LA'-GO. — Heads many-flowered; ray-flowers in 

 several rows, narrowly ligulate; involucre nearly simple; achenes 

 cylindrical-oblong; pappus copious, soft and capillary. 



Tus-si-la'-go far'-fa-ra L. Coltsfoot.— The scapes scaly, 1 -flowered, 

 preceding the rounded-cordate, angled or toothed leaves. 



S. Genus SEN-E'-CI-O. — Heads many-flowered, flowers yellow, in- 

 volucre simple or with a few bractlets at the base, receptacle flat, 

 naked; pappus of numerous soft capillar}' bristles. 



A. Roof ainiiial. 



Sen-e'-ci-o lo-ba'-tus Pers. Butter-weed.— Leaves somewat fleshy, ly- 

 rate or pinnate, the divisions crenate or cut-lobed ; rays G-1"J. 



A. Root pficiniial. 



, Sen-e'-ci-o au'-re-us L. Golden Ragwort; Squaw-weed. — Leaves 

 ^ \ thin, the radical simple and rounded, the larger ones mostlv heart- 

 shaped, crenate-toothed, long-petioled; lower stem-leaves Ivrate, up- 

 per ones lanceolate, cut-pinnatifid, sessile or partly clasping. 



