Stems woody, climbing, terete, obscurely angular, branched in middle, villous with multicellular hairs or with curly brown hairs. Leaves alternate, petiolate; leaf blade ovate to ovate-lanceolate, 3-5 X 1-2.5 cm, adaxially dark when dry, sparsely hairy. Inflorescences terminal, 3-6 cm, capitate glandular. Corolla white or blue, 5-6 mm, slightly arching forward; tube sparsely hairy inside; limb slightly 2-lipped, unequally lobed; lower lip 1-lobed, broadly linear, often reflexed; upper lip 3-lobed, middle lobe galeate. Stamens exserted; filaments basally hairy. Capsule ca. 2.5 mm. Seeds ovoid; seed coat thin, transparent, conspicuously reticulate. Fl. May-Aug.
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