Description from Flora of China
Herbs ?perennial. Stems simple or apically 2- or 3-branched, erect, slender, 10-18 cm. Leaves alternate, sometimes opposite, less often verticillate; leaf blade spatulate, 0.8-2.7 × 0.4-1.1 cm, basal spur obtuse, apex rounded to obtuse. Cyme sessile, often 3-branched, less often 2-branched, corymbiform. Flowers sessile, unequally 5-merous. Sepals spatulate, oblanceolate, or linear-oblanceolate, unequal, 2.5-4.5 × 2-3 mm, base attenuate, apex obtuse. Petals yellow, narrowly elliptic to lanceolate, ca. 4 × 1.5 mm, midvein conspicuous, base somewhat narrowed, apex acuminate. Stamens 10; anthers oblong, ovoid, or subglobose, ca. 0.4 mm. Nectar scales suboblong, ca. 0.5 × 0.3 mm. Carpels suboblong to ovoid, ca. 2.5 × 8 mm, base connate, apex acuminate and with a beak ca. 0.2 mm. Follicles horizontally spreading. Seeds brown, narrowly oblong, ca. 0.8 mm, tuberculate. Fl. Feb-Mar, fr. Apr-May.
* Mountainous areas; 300-2500 m. Taiwan.