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

Erect, suffrutescent perennial herbs 0.5–1 m tall. Leaves simple, 5–7 cm long including petiole, petiole stout, blades thick and coriaceous, ovate to broadly ovate, 3–4.5 × 1.8–2.5 cm, glabrous, the veins on lower surface conspicuously raised, margins serrate, apex short-acuminate. Heads 1–2, in compact cymes terminating main stem and lateral branches, 4–5 mm in diameter excluding rays, peduncles ca. 2 cm long, stout, glabrous; outer involucral bracts ca. 3–4 mm long, broad, well differentiated from inner bracts; inner bracts dark purple, erose and with a few short hairs; ray florets ca. 6–8, sterile, rays yellow, obovate, 10–12 × 4–7 mm, apices often bi- or tri-lobed; disk florets ca. 30–34, perfect, corollas yellow; pappus absent. Achenes not seen.

Marquesas Islands, Ua Pou, known only from the type on the summit crest around Oave and the nearby peak of Matahenua, ca. 920 m.