Annual herb, very variable in stature and robustness, c. 30-600 mm tall, stem simple to sparingly branched from the base and above, main stem up to 5-6 mm in diam., erect, glandular-pubescent, hairs up to 0.3-0.4 mm long, glistening-glands as well, leafy throughout, plant not or scarcely blackening on drying. Leaves opposite to alternate, often crowded at base of stem, more distant upwards, c. 17-75 x 3-25 mm, smaller upwards and passing quickly into floral leaves, elliptic to oblong-elliptic, apex obtuse, base of lower leaves tapering into a petiole accounting for up to ± half the total leaf length, becoming sessile upwards, margins entire to deeply toothed (teeth up to c. 3-5 mm long), both surfaces hairy as the stems. Flowers many, corymbose at first, soon elongating into racemes up to 300-500 mm long in robust plants. Bracts (floral leaves) c. 10-40 x 3-10 mm at base of inflorescences; pair of true bracts ± immediately below calyx, lowermost c. 1-5 x 0.1-0.6 mm, hairy as leaves. Pedicels (lowermost) 2-4 mm long. Calyx tube 0.25-0.5 mm long, lobes 3.54.5 x 0.6-1 mm, glandular-pubescent, hairs c. 0.25-0.5 mm long, glistening glands as well. Corolla tube 20-29 x 1.2-2 mm, cylindric, abruptly expanded in throat and there c. 2.5-3 mm in diam., contracted abruptly to mouth and there c. 1.5 mm in diam., limb nearly regular, c. 9-23 mm across, lobes 3.4-10 x 1.8-6 mm, oblong-elliptic, margins often revolute, tube and backs of lobes glandular-pubescent, hairs up to c. 0.25 mm long, glistening glands as well, upper surface of lobes glabrous except for a broad band of minute stalked glands around mouth, these also often within upper part of throat above two patches of clavate hairs, limb whitish to greenish-yellow or clear yellow, darkening with age, sweetly clove-scented at night. Stamens 4, anticous filaments 0.5- long, posticous ones c. 1 mm long, knee-jointed, sometimes bearded with a few clavate hairs, anthers 0.8-1.4 mm long. Stigma c. 0.5-1 mm long, hastate. Style 17-23 mm long. Ovary c. 2-3 x 1.5 mm, thickly clad in glistening glands, glandular hairs as well c. 0.2-0.3 mm long. Capsules 4-15 x 4-6 mm, ± ovate, prominently hairy as ovary. Seeds 0.8-1.5 x 0.4-0.7 mm, usually wingless, occasionally with an incipient lateral or terminal wing. Flowers have been recorded in all months, but the principal season is July to October.
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Annual herb, ± 30-600 mm high; stems simple or little branched, leafy, most parts glandular-pubescent. Leaves: lower ones tapering into long petiole, grading to sessile upwards, up to 75 x 25 mm, ± elliptic, obtuse, margins entire to deeply dentate. Flowers single, in axils of bracts, shortly pedicellate, first in terminal corymbs, then lengthening into racemes up to 500 mm long. Corolla: tube up to 29 x 2 mm, cylindrical but wider near top; limb ± regular, glabrous above except for tiny glands with stalks round mouth, ± white to greenish yellow or yellow, darker when old, clove-scented after dark.
Glandular-hairy annual, up to 600 mm tall. Leaves elliptic, sometimes toothed. Flowers in racemes, corolla tube 20-29 mm long, inflated above, lobes narrow, whitish to yellow or brown, clove-scented at night, fertile stamens 4.
Glandular-hairy annual to 60 cm. Leaves sometimes toothed. Flowers in racemes, ± 9-23 mm diam., tube abruptly inflated above, 20-29 mm long, lobes narrow, whitish to yellow or brown, clove-scented at night, fertile stamens 4.
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