COMPOSITE. (COMPOSITE FAMILY.) 229 
3 6. COREOPSIS, L. Tickseed. 
Heads many-flowered ; the rays mostly 8, neutral, rarely want¬ 
ing. Involucre double ; each of about 8 scales, the outer rather 
foliaceous and somewhat spreading ; the inner broader and ap- 
pressed, nearly membranaceous. Receptacle flat, with membrana¬ 
ceous chaff deciduous with the fruit. Achenia flat (compressed 
parallel with the scales of the involucre), often winged, not beaked 
or narrowed at the top, 2-toothed, 2-awned, or sometimes naked at 
the summit, the awns never barbed downwardly. — Herbs, gen¬ 
erally with opposite leaves, and yellow or party-colored, rarely 
purple, rays. (Name from Kopis, a bug , and Syfns, resemblance; 
from the form of the fruit.) 
§ 1. Corolla of the ray and disk yellow: branches of the style Upped 
with a pointed or acute appendage . 
* Achenia wingless, wedge-oblong, flat, 2-awned or 2-toothed : scales of 
the outer involucre leafy, reflexed : leaves opposite, petioled, generally 
pinnately or ternately compound, the leaflets serrate : biennials ? 
(Plants with the aspect of Bidens, but the awns barbed upwardly.) 
Rays wanting. 
1. C. diSCOldea, Torr.&Gr. (Rayless Tickseed.) Smooth, 
diffusely branched ; leaves ternately divided; leaflets ovate-lanceolate, 
pointed, coarsely serrate; heads paniculate-corymbed ; outer involu¬ 
cre of 3-5 foliaceous bracts usually much longer than the heads; 
achenia hairy; the avms or teeth as long as the corolla , barbed up¬ 
wardly.—Wet places, Ohio and southward. July-Sept. — Plant 
1° - 2° high. 
2. C. bidentoides, Nutt. Dwarf, diffusely branched, smooth- 
ish; leaves lanceolate-linear, cut-toothed, tapering into a petiole; awns 
slender, upwardly barbed, much longer than the corolla or the bristly 
young achenium. - Near Philadelphia, Jfutlall. — A very obscure 
and doubtful plant. 
' h- -s- Rays conspicuous. 
3. C. tricll©sper.na, Mkhx. (Tickseed Sunflower.). 
Smooth, branched ; leaves short-petioled, 5-7-divided ; leaflets lan¬ 
ceolate or linear, cut-toothed, or the upper leaves only 3 - 5-cleft and 
almost sessile ; heads panicled-corymbose;. achenia narrowly wedge- 
Oblono, bristly ciliate above, croumed with 2 triangular or awl-shaped 
stout teeth. — Swamps, Massachusetts to N. Jersey near the coast, and 
southward. Sept. — Rays large, golden-yellow, showy. 
4. C. aristdsa, Michx. (Western Tickseed.) Somewhat 
pubescent; leaves 1 —2-pinnately 5— 7-divided, petioled , lea ets an 
ceolate, cut-toothed or pinnatifid ; heads panicled-corymbose , outer 
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