Plants erect, 30-50 cm tall, with robust rhizome, simple, nodes turgid. Leaves alternate, often crowded at upper part of stem; petiole 4-6 cm; leaf blade lanceolate or ovate-oblong, 8-16 × 4-5 cm, setose between teeth, lateral veins 5-7 pairs, base cuneate, margin coarsely crenate, apex acuminate. Inflorescences terminal, racemose, 5-8-flowered; peduncles 4-10 cm. Pedicels ca. 2 cm, slender, bracteate at base; bract ovate-oblong. Flowers yellow, large. Lateral sepals 4; outer 2: obliquely ovate; inner 2: falcate. Lower sepal narrowly funnelform, narrowed into an involute, short spur. Upper petal triangular-orbicular, apex rounded, cuspidate, abaxial midvein slightly thickened; lateral united petals not clawed, 2-lobed; basal lobes subtetragonous; distal lobes dolabriform, longer, apex rounded; abaxial auricle broad. Anthers obtuse. Ovary fusiform. Capsule unknown. Fl. Aug-Sep.
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