Diascia humilis K.E.Steiner

Annual herb, glabrous, simple or branching from the base. Stems up to 250 mm long, erect or decumbent, tetragonal in cross-section, up to 1.5 mm on a side. Basal leaves few to many, rosulate or crowded, simple, petiolate, spreading or ascending; lamina 4-41 mm long, ovate to elliptic, apex rounded to acute, base attenuate, margins nearly entire to irregularly lobed or divided; divisions up to ± 3 mm long, oblong-ovate to narrowly triangular, entire, acute; petioles up to ± 12 mm; stem leaves smaller, becoming reduced and more dissected upwards, 3-verticillate. Flowers axillary, one or two open per stem, nodding in bud, pedicels 16.0-20.5 mm long, ascending, broadened and dorsiventrally flattened especially where attached to the flower, recurving, but with the capsule turned up slightly, in fruit. Calyx lobes five, ± equal, ± 1.8-2.8 x 0.7-1.0 mm, spreading, lanceolate, acuminate, margins white ciliate. Corolla bilabiate, limb 6.2-7.6 x 7.0-8.6 mm; upper lobes ± 1.4-2.5 x 1.7-2.0 mm, falciform-oblong to oblong-ovate, rounded; lateral lobes ± 2.3-3.0 x 1.9-2.4 mm, broadly ovate, rounded, bases oblique; lower lobe 2.4-3.0 x 2.5-3.1 mm, obovate, rounded to emarginate, upper lobes yellowish pink or reddish purple, with red veins at the base, other lobes similar in colour but lacking veins, all lobes with sessile or semi-sessile dark purple glandular trichomes, especially on inner surface near the base; tube ± 1.0-1.5 mm, distended at base of each lateral lobe into a shallow yellow sac, ± 1.8 mm long, sacs containing yellow oil-secreting trichomes, especially near the tips; central portion of tube turned out to form a boss bearing the stamens, boss ± 1.2-1.5 on anticous side and 0.2-0.3 mm on posticous side, reddish purple in front and back and yellow on sides, connected to the upper lip by a septum. Stamens four, erect, anticous filaments (appearing posticous due to twisting of the base), touching the upper corolla lip, ±2.0 mm long, reddish purple, falciform, glabrous or with a few scattered purple clavate trichomes, posticous filaments (appearing anticous) ± 1.5-1.6 mm. reddish purple, ± straight, except just below the anther where there is a sharp nearly 90° bend and broadening of the filament sometimes with a sterile outgrowth in the opposite direction, bend or outgrowth with purple clavate trichomes; anthers ± 0.20-0.30 mm, strongly cohering, pale pink or whitish, pollen usually orange. Ovary ± 1.3-1.4 x 0.6-1.0 mm, ovate in outline, sometimes with purple markings on upper half, style ± 0.70-0.75 mm long, straight, stigma surrounded by anthers, ovules ± 40-60. Capsule ± 5.0-6.5 x 2.63.0 mm, falciform-ovate in outline, exceeding calyx at maturity; seeds ± 0.65-0.90 mm long, falciform in outline, dorsal surface ridged, ventral surface with seed coat extended to form a cupule with an oblong-elliptical opening.