Herbs perennial, 6--50 cm tall. Stems prostrate, rooting at nodes, upper part and branches ascending, fulvous pilose. Branches often with leaves only at apex. Leaves opposite, upper 2 pairs crowded; petiole 1/2--1/3 X as long as leaf blade, narrowly winged; leaf blade ovate to broadly ovate or suborbicular, (0.7--)1.4--3(--4.5) X (0.6--)1.3--2.2(--3) cm, with appressed articulate hairs, rarely glabrescent, reddish or black glandular punctate mainly near margin, base subrounded to short attenuate, apex acute to obtuse; veins 2--4 pairs; veinlets inconspicuous. Racemes terminal, abbreviated, capitate, 2--4-flowered, rarely with solitary flowers in axils of leaf pairs below inflorescences. Pedicel to 2 mm. Calyx lobes lanceolate, 5--8.5 X 1--1.5 mm, abaxially sparsely pubescent. Corolla yellow; tube 2--3 mm; lobes ovate-elliptic to oblong, 7--8 X 3--6.5 mm, sparsely dull red or black glandular punctate, abaxially dull red at base, apex acute to obtuse. Filaments connate basally into a ca. 2.5 mm high tube, free parts 2.5--4.5 mm; anthers oblong, dorsifixed, opening by lateral slits, ca. 1.5 mm. Ovary pubescent; style 5--7 mm. Capsule subglobose, 3--4 mm in diam. Fl. May-Jun. 2n = 48.
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