Herbs perennial, glabrous. Sterile stems 2.5-3.5 cm. Flowering stems branched, erect, 10-28 cm. Proximal stem leaves verticillate, others alternate or subverticillate; leaf blade linear-spatulate, 0.8-3.5 cm, base obtusely spurred, apex subacute. Cyme corymbiform, dense; bracts leaflike. Flowers shortly pedicellate, unequally 5-merous. Sepals adaxially brown spotted, linear to suboblong, 3.2-6 mm, base spurless, apex subacute and mammillate. Petals ± free, yellow, oblong, 6-8 mm, base slightly narrowed, apex shortly mucronate. Stamens 10; antesepalous ones 4.8-6.5 mm; antepetalous ones inserted 1.7-2.5 mm from petal base. Nectar scales subquadrangular, apically slightly widened, 0.3-0.5 mm. Carpels erect, base connate for 1.3-1.6 mm. Styles 1.7-1.8 mm. Follicles oblong, 5-7 mm, many seeded; placenta subfalcate. Seeds obovoid, 0.6-0.7 mm, shallowly mammillate. Fl. Sep-Oct, fr. Nov.