Annual herb, stems 20-180 mm tall, few to many tufted from the base, in small discrete groups crowded together, mostly simple, sometimes with 1 or 2 branches very low down, glandular-puberulous, nude or with a few greatly reduced leaves near base. Leaves all radical or very nearly so, opposite and decussate, bases connate, blade 6-40 x 2-15 mm, oblanceolate to elliptic tapering to a petiolar part 4-20 mm long (roughly half to almost equalling length of blade), margins entire to obscurely or more sharply but remotely denticulate, both surfaces glandular-puberulous. Flowers many in simple terminal racemes, crowded at first, distant in fruit. Bracts (lowermost) c. 14 x 0.2-0.75 mm, linear or linear-lanceolate, acute. Pedicels (lowermost) 3.5-14 mm long, shorter upwards. Calyx obscurely bilabiate, tube 0.3-1 mm long, anticous lobes 3.5-4.8 x 0.6-1.1 mm, anticous lip split 3-4.8 mm, posticous lobes 3.1-5 x 0.6-1 mm, posticous lip split 2.8-4.5 mm, lobes all narrowly oblong, tips somewhat spathulate, glandular-puberulous all over outside, hairs to 0.3-0.5 mm long. Corolla tube 7.5-10.5 x 1.2-2 mm in throat, cylindric, expanded in upper third, limb 10-14 mm in diam., nearly regular, lobes 3-5.5 x 2.5-6 mm, broadly ovate to subrotund, reflexed, white to mauve-blue (changing colour on one plant), white or yellow around mouth and in throat, tube densely puberulous all over outside, hairs c. 0.1-0.4 mm, both glandular and eglandular, ± sessile glistening glands on backs of lobes, inside a longitudinal posticous band of clavate hairs (often dark-coloured), throat otherwise almost glabrous. Stamens 4, anticous anthers 0.4-0.6 mm long, tips just visible in mouth, posticous anthers 1.1-2 mm long, included, posticous filaments bearded, hairs mostly dark. Stigma 5.4-7.5 mm long, shortly exserted or just included. Style 0.6-1.4 mm long. Ovary 1.4-2 x 0.6-1 mm. Capsules 4.5-7 x 3-4 mm. Seeds 0.5-0.6 x 0.3-0.4 mm, violet-blue (young?) or pallid.
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