200 COMPOSITiE. (COMPOSITE FAMILY.) 



Less.) — Pcnn. to Michigan, Illinois and sonthward. Aui;. - Sept. — Heads cx- 

 haliny the odor of anise when bruised : disk turning hrownisli. 



* « * * Ac/ienia wimjless, flat, 2-awned, 2-toothid, or rureli/ truncate, l-neived or 

 ridyed on each Jace : acales uf the outer inrolucre leafy, njhxid or s/madiiK/ : 

 leaves ojj/tosUe, jittiuled, (jencrully pinnatd;! or teriiately compound, the leaves or 

 leaflets serrate: biennials or annuals, with the aspect of Bidens, intermediate be- 

 tween that (jenus and Coreopsis ; — ««(/ certain amblijitous (hybridized?) speci- 

 mens, With the awns barbed some it/iwuids and some downwards, connect the ttco. 

 •*- J!iii/s cons/ticuous, ijulden-yillow. 



9. C. arist6sa, Miehx. Somewhat pubescent; leaves 1 -2-pinnately 5- 

 7-dividcd, petiolcd; leaflets lanceolate, cut-toothed or pinnatifid; heads paniclcd- 

 corymbosc; outer involucre of 10-12 leafy bracts; achcnia derate, often ob- 

 scurely wing-margined, bristly-ciliate, with 2 (rarely 4) long and slender divere/ing 

 aicns as long as the achenium itself. — Swamjjs, Ohio to Michigan, Wisconsin, 

 and southwcstward. Ang. -Oct. — Var. ml'tica has two short divergent teeth 

 or points in place of the awns. — W. Illinois and southwcstward, where a form 

 (C. involucrhta, Nutt.) occurs with the bracts of the outer involucre more leafy, 

 numerous, and hirsute. Mr. Fritchey sends, from near St. Louis, specimens with 

 short awns and their barbs cither spreading or retrorse, and others with long 

 awns retrorscly barbed, — perhaps hybrids with some Bidcns. 



10. C. trichosp6rma, Michx. (Tickseed Sunflower.) Smooth, 

 branched; leaves short-pctioled, 5-7-divided; leaflets lanceolate or linear, cut- 

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

 corymbose ; achenia narrowly wedf/e-oblong or the inner ones wedge-linear, smooth or 

 minutely appressed-hairy, marginless, crowned with 2 erect triangular ur awl-sltaped 

 stout teeth. — Swamps, Massachusetts to Virginia near the coast. Also Buffalo, 

 New York {G. IF. Clinton), and Illinois {V'uscy), where forms with shorter 

 achenia approach the Southern C. aurea. Aug. - Oct. 



t- -t-Rays none, or rarely sniall and inconspicuous : outer involucre of flew {usually 

 3-5) loose lafy bracts commonly surpassing the heads: achenia minutely ap- 

 pressed-puhi scent : plants glabrous, l°-.3° high. 



11. C. diSCOidea, Torr. & Gr. Diffusely branched; leaves iernately di- 

 vided, slender-])etioled ; leaflets ovate-lanceolate, pointed, coarsely serrate ; heads 

 2"-3" long; achenia linear-wedge-shapid (2"-3" long), bearing a pair of short 

 and stout upwardly-barbed awns of the length of the co'olta. — Wet banks and 

 swamps, Delaware ( W. M. Canby) to Ohio, Illinois, and southward. July. 



Anomalous specimens, from near Pliihulclphia {A. II. Smith, &c.), growing 

 with Bidens frondosa, differ from suuiU forms of that only in the less rigid and 

 upturned barlis of the awns. 



12. C. bidentoides, Nutt. Taniculately branched ; leaves undivided, Ian- 

 ciobile, coarsely toothed, taper-pointed, and the base tapering into a slender pet- 

 iole; heads G"- lU" long; achenia. nearly subulate tapering downwards, bearing a 

 pair of eery slender upwardly roughened awns sur/iassing the corolla (4" long), but 

 shorter than the achenium, often also 2 minute teeth alternate with the awns. — 

 Shores of Delaware liiver, near Philadelphia, and in Delaware, Nuttail, Durand, 

 A. U. Smith, W. M. Canby. 



