Herb, up to 1.2 m high, unbranched or sparsely branched. Stems and branches up to 0.7 cm in diam., terete, not winged; internodes 1.1-14.3 cm long. Leaves sessile, cauline evenly; blade membranaceous, elliptic (ovate towards apices of branches), 1.3-15.5 x 0.3-7.9 cm, margin not thickened, flat, apex acute, base attenuate (obtuse just below inflorescence). Inflorescence 1-34-flowered; bracts ovate to oblong, 0.4-4.1 mm long, apex acute to obtuse; pedicel 4-13 mm long. Flowers erect to horizontal; calyx green, 6-14 x 5-10 mm, lobes fused for 1/6-1/5 of total length, ovate to oblong, 4-11 x 3-8 mm, margin membranaceous, apex acute; corolla white to greenish-white to pale yellow with dark green spot on apex of each corolla lobe, funnel-shaped, 28-80 mm long, 15-28 mm wide at mouth, lobes ovate, 4-11 x 3-12 mm, apex acute to obtuse; stamens not exserted from corolla mouth, filaments 13-38 mm long, straight, anthers white, oblong, 1.5-3.2 mm long, straight; pollen exine differentially reticulated with complete muri or sometimes fragmented into globules and elongated processes (according to Nilsson 1970, 2002); pistil 23-54 mm long, ovary 5-6 x 3-5 mm, style 16-41 mm long, stigma lobe orbicular, 1.7-4.2 x 1.7-3.6 mm. Fruit erect, brown, ovate to oblong, 6-22 x 5-11 mm; seeds brown, 0.1-0.6 mm in diam.
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