188 COMPOSITiE. 



*** Leaves opposite^ divided. 



3. C. trichosperma Mich. : smooth ; stem obtusely 4^angled ; leaves op- 

 posite, on short petioles, pinnate ; leafets 5 — 7, linear-lanceolate, serrate or 

 incised ; uppermost 3-^5-cIeft, nearly sessile ; scales of the outer involucre 

 subspatiilate, ciliate-serrate ; achenia cuneiform, with ^hispid teeth. 



Swamps. N. Y. and Mass. to Car. Aug. — Oct. ^.—Stem 2 — 3 feet high, 

 much branched. Heads in paniculate corymbs, on long slender peduncles ; 

 rays about 8, yellow, oblong, obtuse, entire. Tick-seed Sunflower. 



4. C. tripteris Linn. : smooth ; leaves opposite, petiolate ; radical 5-pin- 

 nate ; cauline ternate ; leafets lanceolate, acute, entire, scabrous on the 

 margins ;" achenia obovate, naked at the summit. Chrysostemma tripteris 

 Less.D.C. 



Banks of streams. Penn. to Flor. W. to Miss. Aug.— Oct. %.—Stem 4—6 

 feet high. Heads raXher small,' in a loose terminal corymb, on short peduncles; 

 rays about 8, yellowish. • Three-leaved Coreopsis. 



5. C. verticillata Linn. : smooth ; leaves closely sessile, ternate ; leafets 

 pinnate or bi-pinnate ; segments narrow-linear, obtuse ; achenia obovate- 

 wedgeform, 'slightly winged, with 2 minute teeth. C. tenuifolia Pursh. 



Wet grounds. Md. to Car. W. to 3Iich. and Ark. July— Sept. %—Stem 

 1 — 3 feet high, slender, somewhat branched. Leaves appearing as if whorled. 

 Heads yellow ; rays long and narrow, rarely obtuse and 2 — 3-toothed. 



Whorl-leaved Coreopsis. 



34. ACTINOMERIS. Aw^^.— Actinomeris. 



(From the Greek aKTiv, a ray, and //sfxf, apart; the flower being imperfectly 

 radiate.) "" 



Heads many-flowered ; ray flowers neutral, few, elongated or 

 sometimes wanting ; those of the disk tubular, perfect. Invo- 

 lucre of 1 — 3 series ; the scales leafy, acuminate. Receptacle 

 convex, chaffy, the chaff embracing the margin of the achenia. 

 Achenia compressed, obovate, winged, with 2 smoothish .per- 

 sistent awns at the summit. 



A. squarrosa Nutl. : stem erect, pubescent and winged towards the sum- 

 mit ; leaves broad-lanceolate, acute, serrate, scabrous above, pubescent be- 

 neath; lower often opposite, upper alternate; involucre in 2 series; the 

 outer reflexed, spreading. Coreopsis alternifolia Linn. Verbesina Coreop- 

 sis Mich. 



Moist grounds. Yates county, N. Y. to Car. W. to Miss. Aug., Sept. %..— 

 Stem 3—6 feet high," slender, smooth below. Heads small, in a termmal leafy 

 corymbose panicle : rays few, oblanceolate, yellow ; disk greenish-yellow. 



Squarrose'Actmomeris, 



35. HELIANTHUS. I^mw.— Sunflower. 

 (From the Greek jjXlof, the sun, and avQoi, n. flower.) 



Heads many-flowered; ray flowers in one series, ligulate, 

 neutral; those of the disk tubular, perfect. Involucre imbri- 

 cate in several series ; the scales usually with foliaceous tips. 

 Receptacle flat or convex ; the chaff embracing the compressed 



