Shrubs glabrous except for calyx lobes. Branches 1-3 m; branchlets brownish; pith lamellate. Leaves simple; petiole 5-10 mm; leaf blade ovate to long elliptic, 2-9 × 1-3.5 cm, subleathery, base cuneate or subrounded, margin entire, apex acute to caudate-acuminate. Flowers solitary in leaf axils. Pedicel 1-4 mm. Calyx lobes broadly ovate, 1.5-3 mm, ciliate. Corolla yellow outside, red striped inside; tube 5-6 mm; lobes oblong or elliptic, ca. 1 cm, blunt. Stamens slightly longer than corolla tube. Pistil shorter than stamens. Capsule ovoid, 8-10 × 5-8 mm, obscurely lenticellate; stalk 2-4 mm. Fl. Apr-May, fr. Jun-Oct.
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