Perennial, scrambling, suffruticose herb; root system unknown. Stems up to 1.5 m, ascending, quadrangular, leafy, with usually lateral flowering branches; indumentum of long, white, antrorse, eglandular hairs, usually with patent, glandular hairs above. Lower leaves narrow oblong-ovate, 9-45 x 6-19 mm, decreasing in size up the stem, serrate, rounded-cuneate, acute; upper leaves broad oblong-ovate, 2-6 x 2-3 mm, entire, cuneate, obtuse or acute; indumentum on lower leaves of short dense eglandular hairs, on upper leaves longer with glandular hairs, usually with sessile glands abaxially. Lower leaf petioles 2-10 mm, c. 1 mm above. Inflorescence lax, axillary. Flowers secund, in axils of upper, bract-like leaves. Pedicels 2-4 mm, erect or spreading-erect, usually with small basal scales, sometimes flattened. Calyx c. 1.5 mm with a small scutellum in flower, enlarging in fruit to 3 mm with a 3 mm high scutel-lum; indumentum similar to that of inflorescence axis but longer. Corolla yellow-pale violet, 14-17 mm, with glandular or eglandular pilose hairs, erect or spreading-erect, tube 8-10 mm, slender at base. Nutlets smooth; black, covered with white adpressed hairs, 1.2 x 0.8 mm.