Diascia pusilla K.E.Steiner

Annual herb, rosulate, glabrous, simple or branching from base. Stems decumbent, up to 150 mm long, angular, up to 6-sided, ribs 2 or more, sides up to 2 mm wide. Leaves simple, opposite or alternate, petiolate; lamina obovate to elliptic, 5-28 x 2-9 mm, apex acute to apiculate, base attenuate; margins lobed to divided, lobes or divisions ovate to triangular, entire, acute to apiculate; petioles up to ±12 mm long; cauline leaves progressively smaller upwards. Flowers axillary, 1 to 3 open per branch, unscented; pedicels 17-23 mm long, ascending, dorsiventrally flattened especially where attached to flower, recurved in fruit except for upward curving apical portion. Calyx lobes 5, spreading, lanceolate, ± equal, 2.3-2.9 x 1.0-1.2 mm, acuminate; margins white-ciliate. Corolla bilabiate, 5-lobed, limb 9.1-13.5 x 9.0-14.3 mm; lobes broadly ovate; upper lobes 2.6-3.5 x 2.9-4.0 mm, outer sides longer than inner sides, apices rounded to emarginate, bases oblique; lateral lobes 2.5-3.5 x 3.0-3.5 mm, sides ± equal, apices rounded; lower lobe 3.3-5.0 x 3.2-5.8 mm, emarginate to obcordate; upper lobes greyish magenta (14D6) on inner surface, pinkish white (13A2) on reverse side, with deep magenta (14E8) lines at base; other lobes similar in colour but lacking lines, sparsely glandular puberulous with dark violet, glandular trichomes, especially on inner surface near base; tube shallowly cupped, deep magenta and yellow, bi-saccate, sacs ovate in outline, 2.2-2.5 x 1.2-1.4 mm, projecting downward and diverging slightly at tips, yellow, oil-secreting glandular trichomes within; central stamen-bearing boss oblique, anticous portion 1.2-1.9 mm high, deep magenta (14E8), posticous portion 0.3-0.5 mm high, yellow. Stamens 4, erect, partly hidden; anticous filaments (twisted at base and appearing posticous) falciform. 3.0-3.2 mm long, bases strongly curved, sparsely pubescent, trichomes clavate; posticous filaments geniculate, thickened, 2.0-2.5 mm long, bend pubescent, trichomes clavate, dark violet, apical portions, below anthers, bent forward without enlargement; all filaments greyish magenta (13E6) except just below anthers; anthers 0.3-0.5 mm long, strongly cohering, grey; pollen yellow to orange. Ovary oblong-ovoid, laterally compressed contrary to septum, 1.2-1.5 x 0.9-1.0 mm; style 1.3-1.5 mm long, curving forward at tip; stigma subcapitate, surrounded by anthers; ovules ±23-38. Capsule falciform ovoid, 6.0-7.1 x 3.5-4.6 mm, ± twice as long as calyx at maturity. Seeds reniform, 0.9-1.2 mm long, dorsal surface ridged, ventral surface with an oblong, keyhole-like opening formed by extensions of seed coat, long sides of opening bearing a reniform perforation; embryo curved.