Herb to subshrub, up to 2.5 m high, unbranched to sparsley branched. Stems and branches up to 1.1 cm in diam., strongly quadrangular, 4-angled to 4-winged, wings 0.1-1.3 mm wide; internodes 0.5-30.3(-47.3) cm long. Leaves sessile, cauline, evenly distributed along stem; blade membranaceous, elliptic, 2.9-23.2 x 1.2-8(-12) cm, margin not thickened, flat, apex acute to acuminate, base attenuate, obtuse to truncate. Inflorescence 3-100-flowered; bracts ovate with obtuse (acute) apex, 0.8-9.4 mm long; pedicel 4-9 mm long. Flowers erect to horizontal; calyx green, 4-8 x 3-6 mm, lobes ovate, 2-6 x 2-4 mm, margin membranaceous, apex obtuse; corolla white, cream, with dark green spot on apex of each corolla lobe, funnel-shaped to campanulate, 20-50 mm long, 8-21 mm wide at mouth, lobes ovate, 3-11 x 4-13 mm, apex obtuse or acuminate; stamens exserted or not, filaments 14-40 mm long, straight, or curved downward close to anther, anthers white to pale green, oblong, 2-3.8 mm long, straight to slightly curved; pollen exine with muri fragmented into elongated to knob-like processes that are thickened along equatorial zone (see Hequet, 2007; Maguire & Boom, 1989; Nilsson, 1970, 2002); pistil 24-34 mm long, ovary 4.4-5.6 x 2.1-2.6 mm, style 14-23 mm long, stigma lobe elliptic to obovate, 2.8-4.4 x 1.1-2.3 mm. Fruit nodding, brown, 8-23 x 3-10 mm; seeds brown, 0.1-0.4 mm in diam.
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Herb, 1-5 m tall; stems erect, tetragonal to subterete, slightly winged on the angles, green. Leaves with the lamina broadly ovate to ovate-elliptic, attenuate at the base, acute to short acuminate at the apex, 4-18 cm long and 2.7-10.3 cm wide, thin-chartaceous, the lateral veins in 2 pairs, strongly arcuate, the costa and veins conspicuous beneath. Inflorescences axillary or terminal, borne in large laxly-flowered simple or compound dichasia, often appearing racemose; the peduncles 3.5-14 cm long, terete to subangulate; the pedicels 4-11 mm long, the bracts narrowly ovate, 2-3 mm long. Flowers 2.2-3.2 cm long; calyx 4-6 mm long, cupular, the lobes 2-3 mm long, ovate to subrotund, the margins ? membranous; corolla 2.2-3.2 cm long, greenish-yellow, the lobes 5-7 mm long and 6-8 mm wide at the base, ovate, acute at the apex, erect; stamens included or short-exserted, the filaments inserted ca. 1/4 from the base of the corolla, fili-form, 1.4-2 cm long, the anthers reflexed, inconspicuously mucronate apically; pistil 2-3 cm long, included or short exserted, the ovary oblongoid, 4-6 mm long, 3-4 mm in diameter, the style terete, thickened, the stigma of 2 flattened oblong lobes, the lobes 3-4 mm long, 6-8 mm in diameter, beaked, the beak (persistent style) to 1.8 cm long; seeds tetragonal to slightly irregular, the testa reticulate, 0.2-0.3 mm long.
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