Herb, up to 1.5 m high, unbranched to sparsley branched. Stems and branches up to 0.6(-1) cm in diam., quadrangular, winged, wings 0.6-3.7 mm wide; internodes 0.7-15 cm long. Leaves sessile, cauline evenly; blade membranaceous, ovate to elliptic, obovate, 1.3-13.8(-20.2) x 0.5-4.7(-8.5) cm, margin not thickened, flat, apex acute to obtuse, base cuneate or attenuate (often 2 most apical leaf pairs connate to fully perfoliate). Inflorescence 2-33-flowered; bracts ovate, 1.6-6.5 mm long, apex acute; pedicel 2-7 mm long. Flowers erect; calyx green, 6-10 x 4-7 mm, lobes orbicular, 3-5 x 3-5 mm, margin membranaceous, apex obtuse; corolla greenish white, cream, to pale yellow, with dark green spot on apex of each corolla lobe, tubular to salver-shaped, 19-40 mm long, 8-20 mm wide at mouth, lobes ovate, 3-6 x 3-7 mm, apex obtuse; stamens not exserted, positioned deep within corolla tube, filaments 8-15 mm long, straight, anthers white, elliptic to slightly ovate, 1.6-3 mm long, straight or curved after anthesis; pollen exine differentially reticulated; pistil 17-26 mm long, ovary 5.7-6.6 x 2.2-4.3 mm, style ca. 14 mm long, stigma lobes ovate, obovate, oblong, 2.5-5.1 x 1.8-2.0 mm. Fruit erect to horizontal, brown, ellipsoid, 11-20 x 4-10 mm; seeds brown, 0.1-0.4 mm in diam.
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