COMPOSITE. 



24; 



heads large, solitary, on long, naked, furrowed peduncles ; rays white ; disk 

 yellow ; involucre-scales with brownish margins. July-September. 



13. Coreopsis. Heads many-flowered. Rays about 8 ; neutral. 

 Involucre double. Each series 6-io-leaved. Receptacle flat and 

 chaffy. Achenia compressed, emarginate, 2-avvned. 



C. TINCTORIA (Coreopsis). Smooth; stem erect, branching; radical 

 leaves somewhat bi-pinnate, segments oval, entire ; cauline ones somewhat 

 pinnate, with linear segments ; heads large, numerous, brilliant ; rays bright 

 yellow, brownish purple at base ; achenia smooth. In cultivation, 1-3 feet 

 high. 



14. Bidens. Heads many-flowered. Rays neutral. Involucre 

 double. Outer series large and foliaceous. Receptacle chaffy, flat. 

 Achenia compressed, or slender and 4-sided, armed with 2-4 rigid, per- 

 sistent awns. 



B. FRONDOSA (Beggar-Ticks). Smooth, or slightly pubescent; stem 

 erect, tall, with spreading branches ; leaves pinnately 3-5 parted, segments 

 lanceolate, acuminate, serrate, mostly petiolate ; leaflets of the outer invo- 

 lucre much longer than the flower, ciliate at base ; heads discoid ; achenia 

 flat, cuneate-obovate, 2-awned, with rough margins. A troublesome weed 

 in moist grounds. July-September. 



15. Senecio. Heads many-flowered, either discoid, with tubular, 

 perfect flowers, or radiate, with pistillate rays. Involucre-scales mostly 

 in a single ro\v. Receptacle flat, naked. Pappus simple. 



1. S. VULGARIS (Common Groundsel). Stem erect, branching, angular, 

 mostly smooth ; leaves pinnatifid, toothed, clasping ; radical ones petiolate ; 

 heads discoid, terminal, yellow, in loose corymbs, nodding. In waste 

 grounds, 15' high. 



2. S. AUREUS (Golden Senecio}. Mostly smooth ; stem furrowed, erect, 

 nearly simple ; radical leaves undivided and roundish, mostly cordate, cre- 

 nate, on long petioles ; lower cauline ones lyrate ; upper lanceolate, pinnati- 

 fid, sessile ; heads large, showy, with golden-yellow rays, somewhat umbel- 

 late, in flat, terminal corymbs ; involucre-scales linear, acute. In meadows, 

 io'-2o' high. 



1 6. Artemisia. Heads discoid, few, or many-flowered. Flowers 

 all tubular. Involucre-scales imbricate, dry and scarious on the mar- 

 gins. Receptacle flat, naked, or slightly hairy. Achenia with a small 

 disk at summit. Pappus none. 



1. A. VULGARIS (Mugworf). Stem erect ; leaves whitish tomentose be- 

 neath ; cauline ones pinnatifid, with linear-lanceolate, entire, or incised 

 lobes ; heads few, erect, nearly sessile, purplish, racemose, forming a loose, 

 leafy, terminal panicle ; involucre tomentose. Plant 2-3 feet high. July- 

 August. 



2. A. ABSINTHIUM (Wormwood). Stem erect, furrowed, very branch- 



