5.
Verbesina alternifolia
(Linnaeus) Britton ex Kearney, Bull. Torrey Bot. Club. 20: 485. 1893.
Coreopsis alternifolia
Linnaeus, Sp. Pl. 2: 909. 1753
Plants
(30—)100—200+ cm (perennating bases ± erect or horizontal rhizomes, internodes winged, at least proximal).
Leaves
all or mostly alternate (proximal sometimes opposite); blades lance-elliptic or lanceolate to lance-linear, 10—25+ × 2—8+ cm, bases narrowly cuneate, margins coarsely toothed to subentire, apices attenuate, faces scabrellous.
Heads
(3—)8—25(—50+) in corymbiform to paniculiform arrays.
Involucres
± saucerlike, 10—12+ mm diam.
Phyllaries
8—12+ in 1(—2) series, ± spreading to reflexed, spatulate or lance-linear to linear, 3—8+ mm.
Ray florets
(2—)6—8+; laminae 15—25+ mm.
Disc florets
40—60+; corollas yellow.
Cypselae
dark brown to black, oblanceolate to ± orbiculate, 4.5—5 mm, faces sparsely hirtellous to glabrate;
papp
i 1.5—2 mm.
2
n
= 68.
Flowering Aug—Oct. Alluvial flats, along streams, woodlands; 10—600 m; Ont.; Ala., Ark., Del., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Md., Mich., Miss., Mo., Nebr., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Va., W.Va., Wis.
Verbesina alternifolia
may be no longer present in Delaware.
