14.
Coreopsis verticillata
Linnaeus, Sp. Pl. 2: 907. 1753.
Perennials,
20—60+ cm.
Internodes
(± mid stem) 15—40(—60) mm.
Leaves:
petioles 0—1 mm; blades usually 3-foliolate, simple blades or leaflets entire or each ± pedately divided with 3—9+, ± linear to filiform lobes 5—25(—45+) × 0.5—1(—2) mm.
Peduncles
2—5(—8+) cm.
Calyculi
of 8 linear bractlets 3—5(—9) mm.
Phyllaries
8, lance-ovate, 6—7 mm.
Ray laminae
12—20+ mm.
Disc florets
30—40+; corollas yellow (sometimes drying blackish), 3.5—5.5 mm.
Cypselae
obovate to oblong, 3.5—4 mm.
2
n
= 26, 52, 78.
Flowering Jun—Jul(—Aug). Oak wood, sandy soils; 10—500 m; Ont., Que.; Ala., Ark., Conn., D.C., Fl., Ga., Ky. Md., Mass., Miss., N.J., N.Y., N.C., Ohio, S.C., Tenn., Va., W.Va.
