220 COMPOSITE. (COMPOSITE FAMILY.) 



i 1 . Corolla of the ray and disk yellow : branches of the style tipped with a pointed 



or acute appendage. 



% Arhtnia irim/lcss, wedge-oblong, Jlat, 2-awned or 2-toothed : scales of the outer invo- 

 lucre li'iif'/, rijl/.ced: leaves opposite, petioled, generallj pinnatcly or tcniately com- 

 pound, the leajlr-ts serrate : biennials ? (Plants with the aspect of Bidcns, but 

 the awns barbed upwardly.) 



*- Rays wanting. 



1. C. discoid ea, Torr. & Gr. Smooth, diffusely branched; leaves ter- 

 .lately divided; leaflets ovate-lanceolate, pointed, coarsely sen-ate; heads panicu- 

 iate-corymhed ; outer involucre of 3 - 5 foliaccous bracts usually much longer than 

 the heads ; ache'iia hairy ; the awns or teeth as long as the corolla, barbed upward. 

 Swamps, 111., Ohio and southward. July- Sept. Plant 1 -2 high. 



2. C. bideiltoides, Nutt. Dwarf, diffusely branched, smoothish ; leaves 

 lanceolate-linear, cut-toothed, tapering into a petiole ; awns slender, upwardly 

 barbed, much longer than the corolla or the bristly young achenium. Near Phil- 

 adelphia, Nuttall. A very obscure species. 



+- *- Rays conspicuous (golden-yellow and showy). 



3. C. trichospcrma, Michx. (TICKSEED SUNFLOWSR.) Smooth, 

 branched; leaves short-petiolcd, 5-7-dividcd; leaflets lanceolate or linear, cut- 

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

 corymbose ; achenia narrowly wedge-oblong, bristly-ciliate above, crowned with 2 

 triangular or awl-sliaped stout teeth, Swamps, Massachusetts to Virginia near 

 the coast. Sept. 



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

 5-7-dividcd, petioled; leaflets lanceolate, cut-toothed or pinnatifid ; heads pani- 

 cled-corymbose ; outer involucre of 10-12 leafy bracts; achenia oblong-obovate, 

 obscurely margined, bristly-ciliate, with 2-4 long and slender dim-ging amis (in 

 one variety awn less). Swamps, Michigan to Wisconsin, and southward. Aug. 



# * Achenia elliptical, narrowly winged, the narrowly notched summit of the wing 

 minutely lacerate-toothed : scales of the. outer involucre foliaceous, much smaller than 

 the inner, all united at the base : rays obtuse, entire : leaves opposite, petioled, 3 

 5-divt'dcd : perennial. 



5. C. triptci'is, L. (TALL COREOPSIS.) Smooth; stem simple (4- 

 9 high), corymbed at the top; leaflets lanceolate, acute, entire. (Chrysostem- 

 ma. Less.) Penn, and Michigan to Illinois and southward. Aug. Heads 

 exhaling the odor of anise when bruised : disk turning brownish. 



* * * Achenia oblong, narrowly winged, minutely or obscurely 2-toothed at the sum- 

 mit: scales of (he outer involucre nairow, about the length of the inner, all unitul at 

 the base: ruys mostly entire and acute: hairs opposite, sessile, mostly 3-dividcd, 

 therefore appearing as if whorlcd: perennial (l-3 high). 



6. C. seiiifolia, Michx. Leaves each divided into 3 sessile ovate-lanceo- 

 late entire Imjlds, therufore appearing like 6 in a whorl : plant minutely soft- 

 pubescent. Sandy woods, Virginia and southward. July. 



Var. Stella ta, Torr. & Gr. Glabrous; the leaves narrower. (C. stellata, 

 Nutt.) Virginia, Kentucky, and southward. 



