Perennial herb (0.2–)0.4–1 m. high; stem glandular-pubescent or glabrous below, pubescent above.. Leaves petiolate; blade ovate to suborbicular, up to 11 cm. long, 10 cm. wide, apex obtuse, base abruptly contracted into the petiole, margins crenate to crenate-serrate, glandular pubescent, sometimes sparsely so or ?glabrous; petiole up to 3 cm. long.. Inflorescence up to 20 cm. long, densely glandular-hairy, sticky; pedicels 5–20 mm. long.. Calyx-lobes lanceolate, 10–30 mm. long, 3–6 mm. wide, nearly free or connate for up to 1 mm. at the base, densely glandular-pubescent.. Corolla white, glandular-pubescent; tube 50–65 mm. long; lobes oblong-ovate to broadly obovate, (10–)15–20 mm. long, 8–14 mm. wide, mucronate (mucro ± 2 mm. long).. Anthers with apical glands; episepalous stamens 1–5 mm. included within the corolla tube; anthers oblong, ± 2.3 mm. long, 1.3 mm. wide; epipetalous stamens with anthers partly or entirely exserted, anthers oblong, ± 2 mm. long, 1.2 mm. wide.. Nectary scales linear-subulate, 3.5–7 mm. long.. Carpels oblong-lanceolate, 18–22 mm. long, attentuated into styles 32–40 mm. long.
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