10.
Coreopsis palmata
Nuttall, Gen. N. Amer. Pl. 2: 180. 1818.
Perennials,
30—80 cm.
Internodes
(± mid stem) 25—50 mm.
Leaves:
petioles 0—1 mm (or 5—25+ mm, winged, and scarcely distinct from blades); blades not 3-foliolate, most with 3(—5+), ± oblong to linear lobes (5—)15—40+ × 2—3(—7+) mm (sometimes some leaves not lobed).
Peduncles
1—4+ cm.
Calyculi
of 9—12+ oblong to lanceolate bractlets 3—9+ mm.
Phyllaries
8, ± oblong to nearly orbiculate, 6—10 mm.
Ray laminae
15—25+ mm.
Disc florets
60—80+; corollas yellow (sometimes drying blackish), 5—6.5 mm.
Cypselae
oblong, 5—6 mm.
2
n
= 26.
Flowering Jun—Aug. Prairies, open woods; 100—300 m; Ark., Ill., Ind., Iowa, Kans., La., Mich., Minn., Mo., Nebr., Okla., S.Dak., Wis.
