Glabrous pruinose perennial; stem erect or decumbent at the base, 0.5–1.3 m. or more tall.. Leaves opposite, sessile, obovate to broadly obovate or subcircular, up to 20(–25) cm. long, 13 cm. wide, apex obtuse, base cuneate and semi-amplexicaul, margins entire, undulate, crenate or serrate, glaucous, often with purple markings above and beneath.. Inflorescence a paniculate cyme borne on a flowering stem up to 30 cm. or more long; pedicels ± 15(–25) mm. long.. Calyx-lobes linear-triangular, (5–) 10–17 mm. long, (2–)3–6 mm. wide, long-attenuate, connate at the base for 1–2 mm.. Corolla white, rarely cream, sometimes flushed with pink, greenish on the lower part of the tube; tube (19–)45–120 mm. long; lobes overlapping in bud, lanceolate to broadly obovate, (6–)10–25 mm. long, 6–13 mm. wide, mucronate (mucro ± 2 mm. long).. Anthers oblong, with apical glands ± 0.3–0.4 mm. in diameter; episepalous stamens included within the corolla-tube, anthers ± (1.5–) 4–5 mm. long, (0.7–)1.5–2.5 mm. wide; epipetalous stamens barely protruding, anthers ± (0.9–)2–2.5 mm. long, (0.5–)1–1.5 mm. wide.. Nectary scales linear, (4–)4.5–9(–12.5) mm. long.. Carpels ovate-lanceolate, (9–)15–30 mm. long, attenuate into styles (9–)30–80 mm. long.
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