Erect annual herb, 10-25 cm tall. Cauline leaves 5-10 x 2.5-7 mm, ovate-elliptic, 2-3 lobed, with truncate base; lobes obtuse-acute, longer than broad, all antrorse, (5-7 x 2.5-4 mm, elliptic and 2-lobed in aestival and 7.7-10 x 4.5-7 mm, ovate and 3-lobed in autumnal form). Racemes dense. Floral leaves 3.5-11 x 3-10 mm, ovate-broadly ovate, 4-5 lobed, with cuneate base; lobes acuminate – aristulate, longer than broad, all antrorse, rarely lower patent (3.5-6 x 3-5 mm, ovate, 4-lobed, and lobes acuminate in aestival and 6.5-11 x 5.5-10 mm, broadly ovate, 5-lobed, and lobes aristulate in autumnal form). Flowers 5.5-10 mm long. Pedicels c. 1 mm long. Calyx 2.5-7.5 mm long; lobes 0.5-3.5 x 0.5-1 mm, equal; tube 1-3 mm long. Corolla white-lavender with violet streaks, dorsally 5-9 mm long; tube 2-4 mm long, externally pubescent on the tube and the upper lip. Upper lip 2-5 mm long. Lower lip 3-5 mm long; lobes oblong-obovate or obcordate, emarginate, erose-slightly notched, or deeply notched, middle lobe largest 1.7-4 x 1.5-4.5 mm, left and right lobes equal or unequal, left lobe 1.5-3 x 1-2 mm, right lobe 1-4 x 1-3 mm. Two anthers with equal and two with unequal awns, densely hairy; hairs short equalling the shorter awn. Capsule 4.5-7.5 x 1.5-3.5 mm, (4.5-5 x 1.5 mm in aestival and 5.5-7.5 x 2-3.5 mm in autumnal form), elliptic, retuse, equalling the calyces, ciliate at the upper part; cilia soft. Seeds 6-12 per capsule, (6-8 seeds in aestival and 9-12 seeds in autumnal form), oblong, obtuse.