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43c. Packera pseudaurea (Rydberg) W. A. Weber & Á. Löve var. semicordata (Mackenzie & Bush) Trock & T. M. Barkley, Sida. 18: 386. 1998.
Senecio semicordatus Mackenzie & Bush, Rep. (Annual) Missouri Bot. Gard. 16: 107. 1905; S. pseudaureus Rydberg var. semicordatus (Mackenzie & Bush) T. M. Barkley
Plants 20–40+ cm (slender). Basal leaves: petiole lengths 1.5–2 times blades; blades broadly lanceolate to ovate, 20–40 × 10–20 mm, margins crenate. Heads 6–12 in open or slightly congested, corymbiform or cymiform arrays. Phyllaries 4–6 mm. 2n = 88, 126, 138.
Flowering early Apr–mid Jun. Damp areas and open prairies; 300–1500 m; Iowa, Kans., Minn., Mo., Nebr., N.Dak., S.Dak.
Variety semicordata resembles var. flavula; it grows in open prairies.
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