220 COMPOSITE. (COMPOSITE FAMILY.) 



$ 1. Corolla of the ray and disk yellow : branches of the style tipped with a poinfa* 



or acute appendage. 



Achenia wingless, wedge-oblong, flat, 2-awned or Z-toothed : scales of the cuter invif 

 lucre leafy, re flexed: leaves opjnsile, petioled, generally pinnately or ternately com- 

 pound, the leaflets serrate : biennials? (Plants with the aspect of Bidens, bur 

 the uwns barbed upwardly.) 



+-Rays wanting. 



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

 nately divided; leaflets ovate-lanceolate, pointed, coarsely serrate; heads panicu- 

 late-corymbed ; outer involucre of 3 - 5 foliaceous bracts usually much longer than 

 tlie heads ; achenia hairy ; the awns or teeth as long as the corolla, barbed upward. 

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



2. C. bidcntoides, Nutt. Dwarf, diffusely branched, smoothish ; kaves 

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

 barbed, much longer than the corolla or the bristly young achenium. - -2scar Phil- 

 adelphia, NuttaU. A very obscure species. 



- *- Rays conspicuous (golden-yellow and shorn/ ) . 



3. C. trictiospcrma, Miclix. (TICKSEED SUNFLOWBR.) Smooth, 

 branched; leaves short-petioled, 5-7-divided; 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, croicncd with 2 

 triangular or awl-shaped stout teeth. Swamps, Massachusetts to Virginia pear 

 the coast. Sept. 



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

 5 - 7 -divided, petioled ; leaflets lanceolate, cut-toothed or pinnatilid ; heads pani- 

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

 obscurely margined, bristly-ciiiate, with 2 4 long and slender diverging awns (in 

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



# * Achenia elliptical, narrowly winged, the narroivly 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-*iw,'dvd : perennial. 



5. C. tripteris, L. (TALL COREOPSIS.) Smooth; stem simple (4- 

 J 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 (he sum- 

 mit : scales of the oilier involucre narrow, about the length of the inner, all united at 

 the. base: rays iiioxt/y entire and acute: leai-es opjwsite, sessile, mostly 3-divided, 

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



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

 late entire Intjlta, therefore appearing like 6 in a whorl : plant minutely soft 

 pubescent. Sandy woods, Virginia and southward. July. 



Var. Stellata, Torr. & Gr. Glabrous ; the leaves narrower. (C. stellate, 

 Nutt.) Virginia, Kentucky, and southward. 



