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Corolla 8–13(14) mm. long, pink, mauve, purple or rarely white, with two longitudinal yellowish crests in the mouth of the tube, split to the base on the back, pubescent outside on the lobes, rarely glabrous, papillose inside near the mouth of the tube; lower lip 5–6 mm. long with obovate–oblong lobes, ± 1·5–2·5 mm. wide; upper lobes lanceolate, ± recurved, 2–2·5 mm. long.
Flowers in lax, 3–10–flowered, pedunculate racemes; pedicels 3–12 mm. long, erect in fruit, strigose; bracts lanceolate to narrowly ovate, 2–5·5 mm. long, entire; bracteoles usually at or near the base of the pedicel, but sometimes higher up, linear–lanceolate, 1·5–3·2 mm. long.
Leaves oblanceolate to obovate or elliptic, up to 15–55 x 7–22 mm., acute to obtuse at the apex, attenuate into a petiole–like base or cuneate at the base, hirsute on both sides but with ± appressed hairs above, crenate–serrate; venation distinct beneath.
Filaments linear, connate above, attached to corolla–tube at the base, densely pubescent on the inside in the upper part, otherwise glabrous.
Calyx–lobes narrowly triangular, 2–4 mm. long, entire, glabrous to shortly ciliate, somewhat gibbous at the base.
Seeds ± broadly elliptic in outline, trigonous, ± 1 mm. long, very finely reticulate, brown to almost black.
Stems few to many, 15–70 cm. tall, ribbed, ± densely hirsute with ± spreading hairs at least below.
Hypanthium broadly obconical to hemispherical, somewhat oblique, ± 8–nerved, ± strigose.
Anther–tube 1·2–2 mm. long, all anthers densely hairy at the apex, otherwise glabrous.
Capsule ± 8–nerved, ± strigose, with 2 valves 2–3·5 mm. long.
Annual or perennial ± erect or ascending herb from a taproot.
Ovary semi–inferior.
