COMPOSITE. (coitro-siTE FAMILY.) 2s:{ 



*- *- 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 ovate-lanceolate entire leaflets, therefore appearing like 6 in 

 a whorl. Sandy wood.*;, Va. and southward. July. 



Var. Stellata, Torr. & Gray. Glabrous, ami the leaves narrower. Va., 

 Ky., and southward. 



10. C. delphinifolia, Lam. G Lib rous or nearly so; leaves divided into 

 3 sessile leaflets which are 2 - 5-parted, their dirisioiis lance-linear ( 1 -3" broad), 

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



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

 which are I -2-p innately parted into narrowly linear or filiform divisions. 

 Damp soil, from Out. and Mich, to Aid., 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 - 5-dirided ; perennial. 



12. C. tripteris, L. (TALL COEEOPSIS.) Smooth; stem simple (4-9 

 high), corymbed at the top ; leaflets lanceolate, acute, entire. Peim. 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 



flat, obovate or cuneate-oblong, l-nerued on each face, '2-toothed or '2-awned 

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

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



i- 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. 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-ob/ong or the inner ones wedge- 

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

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

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

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



** -w- Achenes obovate, very flat, with thin ciliate margins. 



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

 7-divided, petioled ; leaflets lanceolate, cut-toothed or pinuatifid ; heads paiii- 

 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. MUTICA 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. 



