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Corolla white or cream with greenish tube, pubescent outside; tube abruptly curved just above calyx teeth, inflated above; upper lip obovate, emarginate or truncate; lobes of lower lip 6–8 x 5 mm., obovate, rounded.
Flowers axillary, solitary, alternate, forming long lax terminal spikes; lower bracts leaf-like, the upper linear to subulate; bracteoles c. 4 mm. long, subulate.
Erect annual or biennial herb 15–50 cm. high, usually simple or erect-branched, stems stiff, ± pubescent to densely covered with very short hispid hairs.
Calyx 10–12 mm. long, tubular, very prominently 15-ribbed, 5-toothed, finely pubescent; teeth 3–5 mm. long, linear-lanceolate, elongating in fruit.
Leaves opposite to nearly so, alternate above, linear to linear-lanceolate, 1–4 mm. wide, acute, finely pubescent.
Capsule ovoid, shorter than calyx, apiculate, valves sharply recurved after dehiscence.
