Melampodium longicorne A.Gray

Annuals, 10–60+ cm. Leaf blades lance-elliptic or oblanceolate to lance-linear, 25–50+ × 3–12+ mm, lengths 3–4(–6+) times widths, margins ± dentate or entire. Peduncles 4–30+ mm. Outer phyllaries 5, connate 0–1/6 their lengths, ovate to elliptic, 4–6+ mm. Ray florets 7–12; corollas yellow, laminae oblong-elliptic, 1.2–1.5+ × 0.7–1+ mm. Disc florets 8–10+. Fruits 3–3.5+ mm. 2n = 60.