Perennial, with thick, blackish, tuberous roots. Shoots and lvs puberulent when young, later glabrous or nearly so. Stems swollen at nodes, branched. Petioles usually 1–4 cm long. Lamina 3.5–15 × 3–7 cm (largest in lower lvs), ovate or oblong-ovate, entire; undersurface with numerous rod-like cystoliths; base truncate to broadly cordate; apex acute to acuminate. Upper lvs smaller with shorter petioles. Fls in terminal cymes, fragrant. Involucre calyx-like, 9–15 mm long, hairy, strongly lobed, each containing 1 fl. Calyx 4–4.5 × 3.5–4.5 cm across limb, yellow, magenta or streaked or with sectors of either colour in the same fl., salverform, soon withering; tube c. 3 cm long. Stamens and style exserted. Anthocarp c. 8 mm long, ovoid to ellipsoid, hairy, black or almost so.
[From: Webb et al. (1988) Flora of New Zealand. Volume 4.]
Flowering: Nov.–Apr.