Bidens wichmanii W. L. Wagner, J. R. Clark & Lorence

Scandent to ascending suffrutescent perennial herbs 0.5–2 m tall. Leaves simple, 3.5–13.5 cm long including petiole, blades lanceolate to elliptic-lanceolate, 2.3–9.5 × 1.2–4.5 cm, glabrous, margins serrate, apex acute. Heads 1–3, in diffuse cymes terminating main stem and lateral branches, 8–15 mm in diameter excluding rays, peduncles (2–)3.5–14 cm long, glabrous; outer involucral bracts 8–12 mm long, broad, well differentiated from inner bracts; ray florets 14–20+ per head, sterile, rays yellow, 10–18 × 3–4 mm; disk florets ca. 50, perfect, corollas yellow. Achenes black, straight, 7–10 × 1–2 mm, slightly keeled, glabrous; pappus of 2 irregular antrorse barbed awns.

Marquesas Islands, known only from the central summit region of Fatu Hiva (Tevaiua, Hanativa, and Tekau), 670–870 m.