Stems usually several, 5-15 dm; herbage lightly puberulent basally, glandular-puberulent [glandular-villous] distally. Leaves at midstem with petiole 2-6 cm; blade usually cordate, less often deltate, ovate, or ovate-lanceolate, 5-14 × 3-8 cm. Inflorescences dense clusters of flowers among conspicuous foliaceous bracts 5-20 mm; peduncle 0.5-2 mm; bracts 40-60% connate, 7-11 mm in flower, 10-18 mm in fruit, apex triangular to narrowly triangular. Flowers: perianth white, tube blushed with green or purple, (7-)8-15(-17) cm, pubescent externally. Fruits black to dark brown, bluntly 5-angled in cross section, with low black to dark brown [white] irregular tubercles between angles, ovoid to slightly obovoid, 7-12 mm, base abruptly constricted to truncate, apex tapered to truncate, puberulent between tubercles. 2n = 58.
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