19.
Coreopsis lanceolata
Linnaeus, Sp. Pl. 2: 908. 1753.
Perennials,
10—30(—60+) cm.
Aerial nodes
proximal to first peduncle usually 1—3(—5+), distalmost 1—3 internodes 1—2(—8+) cm.
Leaves:
basal and cauline on proximal
1
/4—
1
/3(—
1
/2) of plant heights; petioles 1—5(—8+) cm; blades simple or with 1—2+ lateral lobes, simple blades or terminal lobes lance-ovate or lanceolate to oblanceolate or lance-linear, 5—12 cm × 8—15(—18+) mm.
Peduncles
(8—)12—20(—35+) cm.
Calyculi
of lance-ovate to lance-linear or linear bractlets 4—8(—12) mm.
Phyllaries
deltate to lance-deltate, 8—12+ mm.
Ray laminae
yellow, 15—30+ mm.
Disc corollas
6—7.5 mm, apices yellow.
Cypselae
(2.6—)3—4 mm, wings ± spreading, ± chartaceous, entire.
2
n
= 26 (+ 0—4B).
Flowering (Mar—)May—Jul(—Aug). Sandy soils, ditches and roadsides, other disturbed sites; 30—500(—1000+) m; B.C., Ont.; Ala., Ark., Fla., Ga., Ill., Ind., Kans., Ky., La., Md., Mich., Miss., Mo., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn., Tex., Vt., Va., W.Va., Wis.
Plants that have been called
Coreopsis lanceolata
var.
villosa
Michaux often have 5+ aerial internodes 6+ cm long proximal to the first peduncle; they may merit recognition as a distinct taxon or may be hybrids (or derivatives) from crosses between
C. lanceolata
and
C. pubescens
.
