COMPOSITE. (COMPOSITE FAMILY.) 283 



4- -- Leaves divided to the base, uppermost and lowest sometimes simple. 



9. C. senif61ia, Michx. Plant minutely soft-pubescent ; leaves each di- 

 vided into 3 sessile ovate-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. delpllinifdlia, Lam. Glabrous or nearly so; leaves divided into 

 3 sessile lea/lets which 8ne2-5-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-pinnately parted into narrowly linear or filiform divisions. 

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

 old gardens, but not showy. July - Sept. 



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



none ; leaves petiolate, pinnately 3 - ^-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, refiexed or spreading ; achenes 



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

 (rarely 4-awned) ; leaves petiolate, usually pinnately 3 -7-divided, the lobes 

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



*- Rays conspicuous, golden yellow. 

 M. 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. Wet ground, Va. to Fl. 



14. C. trichosperma, 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-oblong or the inner ones wedge- 

 linear, about 4" long, smooth or sparsely hairy, marginless, crowned with 2 

 erect triangular or awl-shaped stout teeth. Swamps, Mass, to Va. near the 

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

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



M- -H. Achenes obovate, very fiat, with thin ciliate margins. 



15. C. aristdsa, 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 the achene 

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

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

 W. 111. and southwestward. Forms occur with the barbs of the awns spread- 

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



13 



