Herb or shrub with brittle, semisucculent stems, 0.3-1.0 m tall. Stems leafy, erect, almost rounded, sparsely branched, arising from a thickened rootstock, ± 12 mm diam. At base, tapering to 3-4 mm diam. above, pubescent with very thin glandular hairs 75 ± 15 µm long spreading, thin, simple, unicellular and multicellular, uniseriate eglandular hairs. Leaves opposite; blade elliptic to obovate, (7-)10-18(-20) x 3-10 mm, cuneate at base, rounded at apex, entire or crenate with 4-10 teeth on margin, pubescent with thin capitate glandular hairs and simple, unicellular and multicellular, uniseriate eglandular hairs on both surfaces; petiole 5.0-6.5 mm long. Inflorescence sparse, main axis (100-)120-200(-260) mm long; bracts leaf-like, 4-6 x 1.5-2.5 mm below, becoming progressively smaller and narrower to ± 2.0-2.5 x 1.0-1.5 mm above. Flowers solitary in axil of each bract; pedicel 4-9 mm long, pubescent with glandular hairs and with simple and multicellular uniseriate eglandular hairs. Calyx 6-7(-8) mm long, commonly covered with very thin glandular hairs, eglandular hairs prominent; the longest teeth 2.0-2.5 mm long, short teeth ovate-lanceolate, 1.0-1.5 mm long, acuminate, decurrent on tube, lower four teeth subequal, lanceolate-triangular. Corolla pink with purple spots on lateral lobes, pubescent with glandular and eglandular hairs; tube narrowly cylindrical, (25-)28-30(-32) mm long; central lobe oblong, 5-7 mm long; lower lobe boat-shaped, 6-7 mm long. Stamens: filaments lilac, exserted from corolla mouth 6.0-7.5 mm; anthers purple. Style lilac, lobes purple. Fruit a nutlet.
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