Annual herb 75-150(220) mm tall, stem either simple or divaricately branched from the base or higher, glandular-pubescent, hairs up to 0.25(0.3) mm long, dwarf axillary shoots sometimes weakly developed. Leaves: lower leaves 7-22(14-38) x 0.5-2.5(0.75-4) mm, oblanceolate, entire or with 1-2 pairs of teeth, thinly glandular-pubescent on both surfaces, particularly margins and lower part; upper leaves 10-20(8-35) x 0.5-1.5[0.5-1 (-2)]mm, linear to narrowly oblanceolate, either entire or with 1 pair of teeth. Flowers 2-7(-10) in small terminal clusters becoming lax in fruit, pedicels 0.5-1 mm long. Bracts 5-7(5.5-13) x 0.4-0.75 mm, adnate almost to top of calyx, linear, entire, glandular-pubescent on both surfaces, hairs up to 0.25-0.3 mm long. Calyx 3.5-4.5(4-7.5) mm long, anticous lip shallowly lobed, posticous lobe c. 1 mm long, glandular-pubescent all over, hairs 0.25-0.3 mm long. Corolla tube7.5-10[9-13(-25)] x 0.75-1.25 mm, pubescent, limb 5-8[6.5-9(-11)] mm across, lobes oblong-elliptic, pos ticous ones 2-3.25(2.5-4.5) x 1-2(1.5-2.25) mm, anticous one 2-4(2.5-5) x 1-2(1.75-3) mm, all lobes white or cream [white, cream, pink, purple, both backs of lobes and tube often flushed purple], orange-yellow patch below posticous lip, bearded there, hairs often extending to the other 2 or 3 lobes. Stamens 4, anticous pair well exserted, anthers c. 0.75 mm long, posticous pair included, filaments decurrent nearly to base of tube, anthers in mouth, c. 1.25 mm long. Stigma exserted. Capsules 34.5(6) x 3(3-4) mm Seeds many, c. 1 mm long, distinctly 3-winged.
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Glandular-hairy annual to 20 cm. Leaves sometimes coarsely toothed. Flowers in small, terminal clusters, white or cream-coloured with orange patch below upper lobes, flushed purple on back, salver-shaped, tube hairy, 8-25 mm long.