Perennial herb or subshrub, glabrous, sparsely pubescent or tomentose all over with glandular or eglandular hairs up to 1.5 mm long; stems up to 60(–90) cm long, prostrate, scandent or ascending to erect. Basal leaves ovate to elliptic, (3–)6–20(–25) x 4–12(–25) mm, obtuse or truncate at the apex, coarsely serrate or entire, rounded at the base, petiole 4–12 mm long, not twining; upper leaves ovate, deltate or lanceolate, (3–)7–25 x (1.5–)3–15 mm, acute or subacute at the apex, entire, lobed, or rarely with few teeth near the base, hastate, sagittate or rounded to cordate at the base, petiole (2–)4–14 mm long, not or slightly twining. Pedicels 7–21(–26) mm long, straight, except for curved tip. Calyx-lobes 3–5 x 0.4–1.4 mm, linear-subulate to lanceolate, acuminate, with margins narrowly to somewhat broadly scarious below, glabrous, glandular- or eglandular-pubescent or villous. Corolla 3.5–11 mm long, yellow, glandular- or eglandular-pubescent outside; tube 1.5–3 mm broad at the mouth; palate glabrous or sparsely pubescent; spur 1.2–6.5 mm long, straight, patent or forming obtuse angle with tube, shorter than or almost as long as rest of corolla. Abaxial filaments pubescent. Capsule 2.5–5 mm long, oblong-ovoid to subglobose, glabrous or sparsely glandular-puberulent at the tip; cells equal, many-seeded, dehiscent. Seeds 0.3–0.6 mm long, oblong-ovoid to oblong-ellipsoid, practically always tuberculate, blackish- to reddish-brown; tubercles columnar, subacute or obtuse and papillate, or shortly acute and entire; papillae mostly confined to tubercle-tips, patent, slender, straight or recurved.
