Annual herb 50-300 mm tall, stems simple to well-branched from the base, lower branches often decumbent, basal parts sometimes becoming woody, upper parts herbaceous, leafy, pubescent, the hairs c. 0.5-1 mm long, often ± curled, spreading to retrorse. Leaves opposite, blade c. 7-35 x 5-23 mm, broadly elliptic or ovate, contracted below into a petiolar part 3-20 mm long, triplinerved, margins serrate, blade glandular-punctate, sparsely hairy chiefly on the margins, main veins and lower surface near the base. Flowers many in lax leafy racemes. Bracts 6.5-18 x 2.5-9 mm, leaf-like and grading imperceptibly from leaves to bracts, adnate to pedicel and calyx tube, lower margins with patent hairs 0.5-1 mm long. Pedicels 0.25-1 mm long. Calyx distinctly bilabiate, tube 0.75-1.5 mm long, anticous lobes (2.25-)3-4 x 0.3-0.75 mm, keeled, conduplicate near tips, margins with patent hairs 0.5-1 mm long. Corolla tube 3-5 x 0.75-1.1 mm, slightly broadened in throat, limb 3-4.5 mm across the lateral lobes, posticous lobes 0.3-1.5 x 0.3-1 mm, anticous lobe 1-2.1 x 0.75-1 mm, all lobes oblong, white, orange patch at base of posticous lip and bearded there, the hairs running halfway down the tube inside, a few hairs often present at base of anticous lip. Stamens 4, anthers 0.3-0.6(-0.75) mm long. Stigma well exserted. Capsules 4-6 x 1.5-3 mm Seeds c. 0.5 mm long, irregularly colliculate, amber-coloured. Flowering in any month.
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Annual herbs, stems up to 300 mm high; simple to much branched, lower ones often decumbent, leafy and spreading-to retrorse-haired. Leaves opposite, widely elliptic or ovate. Flowers many in lax racemes, where leaves gradually become bracts upwards. Corolla: lobes white with orange patch at base of upper lip. Flowering time all year.
Hairy annual to 30 cm. Leaves elliptic-ovate, toothed, grading into floral bracts. Flowers in lax, leafy racemes, white with orange patch at base of upper lobes.