Annual or short-lived perennial herb. Stems erect or decumbent. Leaves ovate to elliptic, the lamina 2–7 cm long; lower leaves alternate, petiolate; upper leaves sometimes opposite, sessile or almost so, decreasing in size on flowering stems. Pedicels 2–4 cm long. Calyx 10–20 mm long; lobes oblong. Corolla white; tube obconical, 30–45 mm long; limb rotate to broadly stellate, 40–60 mm diam.; lobes rounded. Stamens on filaments 10–15 mm long; anthers 2–3 mm long. Style 20–30 mm long, erect. Capsule conical, obtuse, 8–12 mm long, not or shortly exceeded by calyx-lobes. Seeds globular or subangular, c. 0.6 mm diam., light brown.
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