composite. 183 



liaceous and spreading ; the inner broader and appressed. — 

 Receptacle flat, with membraneceous chaff. Achenia flat, 

 often winged, 2 toothed, 2 awned, or sometimes naked at 

 the summit. — Herbs with mostly opposite leaves, and yellow 

 or parti-colored, rarely purple rays. 



* Rays wanting. 



1. C. BIDEXTOIDES, Nutt. 



Dwarf, diffusely branched, sua oothish; IsTttis lanceolate linear, cut, toothed t&* 

 paring into a petiele ; awns slender, upwards barbed, much longer than the corol- 

 la, or the bristly young achenia. 



Near Philadelphia, NuttalL— Prof. Gray thinks this a very obscure and undoubt- 

 ful plant. 



* * Rays and disk yelleio ; leaves opposite, divided. 



2. C. trichosperma, Michx. Titfcseed Sunflower. 



Smooth, branched; leaves short petioled, 5 to 7-dirkled; leaflets lanceolate or lin- 

 ear, cut-toothed or the upper leaves only 3 to 5 cleft and nearly sessile ; outer invol- 

 ucre sales subspatulate, ciliate-f erratc ; Heads in corymbose panicles. 



Swamps, near the cca-t Aut- 9c 4 :. Biennial. Stem 2 to 3 feet high, obtusely 

 4,-angled, much branched, smooth. Branches and leaves mostly opposite. Leaves 

 thiu, subsessile. L°.iflcU narrow tapering to a long point with a few unequal re- 

 mote scrratures. H,a Is large showy, yellow. Ac 'tenia narrowly wedge-oblong, 

 bristly ciliate above, crowned with 2 triangular or awl-shapad stout teeth. 



3. C. tripteris, Michx. Three-leaved Tichseed. 



Smooth ; Stem, simple, tall, corymbose at summit ; leaves 3 to 5-divided ; leaflctt 

 lanceolate, acute, entire, seabreuson the margins; heads small on short peduncles. 



Binks of streams. Aug. — Oct. Per. An elegant species, 4 to 6 feet high, slen- 

 der, terete. Divisions of the leaves 3 to 5 inches long, by «% to V/2 inches wide. 

 Huxdi rather smali. in a loose terminal corymb, on short peduncles; rays about 8, 

 spreading % inch long, yellow. The heads exhale th&odor of anise when bruised. 



CULTIVATED SPECIES. 

 * ** Rays or dis 7 ; purple. 



4. C. TINCTORIA, Nutt, . Dyers Coreopsis, Elegant 

 Coreopsis. 



Leaves alternate, those €f the root subpinnate; leaflets oval, entire, smooth; stem 

 leaves subpinnate; leaflets linear ; achenia naked. A handsome border annual, na- 

 tive of the Upper Missouri. Stem 1 to 3 feet high, with light smooth foliage. 

 Heads with yellow rays, beautifully colored with brownish purple at their base. 

 Flowering all summer. Partially naturalized in Uuicn Cc. 



5. C. Drummoxdii, T & GK> Drummond's Coreopsis. 



Pubescent; leaves pinnately divided, sometimes simple, segments (or leaves) 

 oval, entire; involucre secies lanceolate-acuminate: fays unequally 5 toothed, twice 

 1 ongcr than the involucre ; achenia ©borate, incurved, scarcely toothed. A beau- 

 tiful annual from Texas. Stems 10 to 20 inches high. Rays large, yellow, with 

 a. purple spot at the baee. 



B. utrosanyuinea, a variety in cultivation, with dark craugc flowers. 



31. ZINNIA, Linn. 



Dedicated to John Godfrey Zinn, a German botanist, 1567. 



Heads many -flowered ; rays 5, persistent, entire, Distil- 



