Stems 20-100 cm or more, sparsely purple-brown spotted, glabrous, simple or branched, with 18 or more nodes. Petiole 2-6 cm; leaf blade sometimes oblique, elliptic to narrowly lanceolate, sometimes falcate, 7-20 X 2.5-5 cm, nearly glabrous to sparsely pubescent, base cuneate to attenuate, margin weakly serrate to nearly entire, apex acuminate, vermiform sclereids surrounding vascular bundles; lateral veins 6-10 on each side of midrib. Cymes 3-or more flowered; peduncle 1.5-4 cm, glabrous; involucre 2-2.5 cm in diam., outside glabrous. Calyx 5-sect from base; segments equal, lanceolate to narrowly elliptic, 8-12 X 3-4 mm, outside and margin glabrous. Corolla outside white, inside purple spotted, 3.7-4.5 cm, outside glabrous, inside with a ring of hairs; tube 3-3.8 cm; adaxial lip ca. 5 mm; abaxial lip ca. 7 mm. Anthers ca. 3 mm; staminodes 3, 3-8 mm. Pistil 1.5-2 cm, glabrous. Capsule 2.2-2.5 cm. Fl. Sep-Oct, fr. Nov-Dec.
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A herb. It has stems 20-100 cm long. It keeps growing from year to year and has runners. The leaves are opposite and simple. They are 7-20 cm long by 3-5 cm wide and on leaf stalks 2-6 cm long. The flowers occur in groups of 3 or more. The fruit is a capsule which is narrow and slightly curved. It is 2.2-2.5 cm long and 3-4 mm wide. The seeds are narrow and 0.5 mm long.
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