Herbs perennial, to 30 cm tall. Stems erect to arcuate at base, quadrangular or narrowly winged, usually branched from middle. Leaves alternate; petiole 0.8--2.5 cm, narrowly winged by decurrent blade; leaf blade lanceolate, 4--7 X 0.6--1.5 cm, abaxially glabrous, adaxially sparsely bristly or glabrate, minutely glandular, base attenuate, margin finely papillate, apex acuminate; veins 4 or 5 pairs; veinlets inconspicuous. Pedicel 2--2.5 cm, elongating to 3 cm in fruit. Flowers solitary, axillary. Calyx lobes narrowly ovate, ca. 4 mm, apex acuminate to subulate. Corolla yellow, deeply parted; lobes broadly elliptic, 3--5 mm, apex obtuse. Filaments connate basally into a ca. 0.5 mm high ring, free parts very short; anthers ca. 1.8 mm, basifixed, opening by apical pores. Style ca. 4 mm. Capsule subglobose, 3.5--4 mm in diam., ca. as long as persistent calyx. Fl. Jun-Jul.
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