COMPOSITE. (composite FAMILY.) 283 



•i- -I- Leaves divided to the base, uppermost and lowest sometimes simple. 



9. C. senifolia, Michx. Plant minutely soft-pubescent ; leaves each di- 

 vided iuto 3 sessile orate-lanceolate entire leaflets, therefore appearing like 6 in 

 a whorl. — Sandy woods, Va. and southward. July. 



Var. stellata, Torr. & Gray. Glabrous, and the leaves narrower. — Va., 

 Ky., and southward. 



10. C. delphinifolia, Lam. Glabrous or nearly so ; leaves divided into 

 3 sessile leaflets which are 2 - ^-parted, their divisions lance-linear (1-3" broad ), 

 rather rigid ; disk brownish. — Pine woods, Va. and southward. July. 



11. C. verticillata, L. Glabrous; leaves divided into 3 sessile leaflets 

 which are 1 - 2-pinnateli/ parted into narrowly linear or fliform divisions. — 

 Damp soil, from Out. and Mich, to Md., Ark., and southward. Cultivated in 

 old gardens, but not showy, July - Sept. 



* * Outer scales narrow, shorter, cdl united at base ; rays entire, obtuse ; pappus 



none; leaves pet iol ate, p innately 3 - 5-divided ; perennial. 



12. C. tripteris, L. (Tall Coreopsis.) Smooth; stem simple (4 - 9° 

 high), corymbed at the top ; leaflets lanceolate, acute, entire. — Penn. to Wise, 

 Iowa, and southward. Aug. -Sept. — Heads exhaling the odor of anise when 

 bruised ; disk turning brownish. 



* * * Scales mostly distinct, the outer leafy, reflexed or spreading ; achenes 



fiat, ohovate or cuneate-oblong , l-nerved on each face, 2-toothed or 2-awned 

 (rarely i-awned) ; leaves petiolate, usually pinnately 3-7-divided, the lobes 

 serrate; annuals (or biennial), branching. Approaching Bidens. 



-1- Rays conspicuous, golden yellow. 

 ++ Achenes cuneate, obscurely ciliate or naked ; outer scales about 8. 



13. C. aurea, Ait. Nearly glabrous, 1-3° high; leaves variable, com- 

 monly 3 - 7-divided, or some or all undivided, the segments incisely serrate or 

 lobed ; achenes broadly cuneate, 1 - 2" long, with 2 very short blunt spreading 

 teeth. — We*^ ground, Va. to Fl. 



14. C, crichosperma, Michx. (Tickseed Sunflower.) Smooth, 

 branched ; leaves short-petioled, nearly all 3 - 7-divided ; leaflets lanceolate or 

 linear, cut-toothed, or the upper leaves only 3 - 5-cleft and almost sessile ; heads 

 panicled-corymbose ; achenes narrowly wedge-obtong or the inner ones wedge- 

 liyiear, about A" long, smooth or sparsely hairy, marginless, crowned with 2 

 erect triangidar or awl-shaped stout teeth. — owamps, Mass. to Va. near the 

 coast. Also Cayuga, N. Y., to 111., where is a var. XENufLOBA, Gray, with 

 shorter achenes, approaching the last. Aug. - Oct. 



-M- ++ Achenes obovate, very flat, with thin ciliate margins. 



15. C. aristosa, Michx. Somewhat pubescent ; leaves 1 - 2-pinnately 5 - 

 7-divided, petioled ; leaflets lanceolate, cut-toothed or pinnatifid ; heads pani^ 

 cled-corymbose ; outer scales 8-10, not exceeding the inner, barely ciliate ; 

 achenes with 2 (rarely 4) long and slender diverging awns as long as tlie achene 

 itself. — Swamps, Ohio to Mich., Minn., and southwestward. Aug. -Oct. — 

 Var. AitJTiCA has two short divergent teeth or points in place of the awns. — 

 W. 111. and southwestward. Forms occur with the barl)s of the awns spread- 

 ing or retrorse, hybrids with Bidens frondosa or other species- 



13 



