Herbs perennial. Stems procumbent, 20--60 cm, glabrous to sparsely or densely rust-colored pilose, glandular on young parts. Leaves opposite; petiole shorter than to ca. as long as leaf blade; leaf blade ovate to suborbicular or reniform, (1.5--)6(--8) X 1--4(--6) cm, transparent glandular striate, stripes visible with transillumination becoming black and distinct when dry, glabrous to densely strigillose, base truncate to cordate, apex acute, obtuse, or rounded. Pedicel 1--5 cm, usually shorter than subtending leaves, glabrous to densely pilose. Flowers solitary, axillary. Calyx lobes lanceolate, elliptic-lanceolate to linear or subspatulate, (4--)5--7(--10) mm, glabrous, pubescent or with hairs only on margin, apex acute to subobtuse. Corolla yellow; tube 2--4 mm; lobes narrowly ovate to sublanceolate, 5--11 mm, long black glandular striate, apex acute to obtuse. Filaments 6--8 mm, lower 1/2 connate into a tube; anthers ovate, dorsifixed, opening by lateral slits, 1--1.5 mm. Ovary ovoid; style 6--8 mm. Capsule subglobose, 4--5 mm in diam., sparsely black glandular striate. Fl. May-Jul.
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