Annuals to 80 cm tall. Roots yellow, fibrous. Stems erect, ca. 2.5 mm in diam., striate, branched. Leaves sessile or short petiolate; leaf blade linear-lanceolate to lanceolate, 3-6 cm × 4-7 mm including petiole, base obtuse, apex acuminate, veins 3. Inflorescences panicles of cymes, lax, spreading branched, many flowered. Flowers 5merous. Pedicel spreading to erect, 1.5-2 cm, terete. Calyx tube 1-2 mm; lobes lanceolate to ovate-lanceolate, 4-5 mm, apex acuminate, veins 3 outside. Corolla yellow, tube 1-2 mm; lobes oblong, 7-8.5 mm, slightly crenate, apex acute. Nectaries 2 per corolla lobe, orbicular, reduced to a naked gland patch. Filaments ca. 3 mm; anthers ellipsoid, 1.5-2 mm. Style short, distinct; stigma lobes capitate. Capsules narrowly ovoid, ca. 1.3 cm. Seeds ellipsoid; seed coat smooth.

* Grassland slopes, forests; 2300-3000 m. Taiwan.