两色金鸡菊 liang se jin ji ju

Annuals, (10-)30-70(-150) cm. Leaves: proximal blades usually 1(-3)-pinnate, terminal lobes ovate-lanceolate to oblanceolate, 10-60 × 5-25 mm; cauline blades usually 1-3-pinnate, rarely simple, simple blades or terminal lobes linear-lanceolate to linear or filiform, 10-45 × 0.5-5 mm. Peduncles 1-15 cm; calycular bracts deltate-lanceolate, 1-3+ mm; phyllaries ± oblong-lanceolate to ovate-lanceolate, 4-9 mm. Ray limbs usually yellow with red-brown blotch, sometimes red-brown in proximal 1/3-9/10 and distally yellow, rarely yellow throughout, 12-18+ mm. Disk corollas 2.5-3+ mm. Achenes 1.5-4 mm, wings absent or 0.1-0.7 mm wide; pappus absent, or of 1 or 2 cusps or subulate scales 0.1-1 mm. Fl. Jun-Aug. 2n = 24.

Moist sandy or clay soils, sometimes alkaline flats, prairies, ditches, disturbed sites. Widely cultivated and naturalized in China [native to North America].

Coreopsis tinctoria is widely grown in public and residential gardens, is grown commercially (for cut flowers), and has become widely established in the Flora area.