Annual herb (15–) 80–100 cm high; stems softly pilose. Leaves all opposite, ovate, 45–70 mm long, 20–40 mm wide, shallowly crenate, moderately densely softly pilose adaxially, more densely pilose abaxially, especially on veins, with sessile golden glands between veins; petioles 15–20 mm long. Capitula obconical, 5–6 mm diam.; involucral bracts lanceolate, acute, green, densely pilose throughout; paleae stramineous, lacerate and ciliate at apex, striate, with short appressed hairs and sessile golden glands dorsally. Ray florets 2 or 3; corolla 3–4 mm long, yellow; ligule 2-lobed. Disc florets 2 or 3; corolla 4–5 mm long, yellow. Achenes 4–6, grey, very finely transversely wrinkled, shortly pilose at apex and on angles; ray achenes cylindrical, ±straight, 5.5 mm long, minutely tuberculate, with pappus of c. 7 erect to subpatent flattened pilose scales 2–3.5 mm long; disc achenes similar, but smooth, usually lacking tubercles.
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