Diascia collina K.E.Steiner

Annual herb, rosulate, glabrous, simple or branching from base. Stems decumbent, up to 340 mm long, angular, up to 6-sided, ribs 2 or more, sides up to 2 mm wide. Leaves simple, alternate, opposite or whorled, petiolate; lamina ovate to obovate, 4-33(-60) x 3-11(-13) mm, apex rounded to acute or apiculate, base attenuate; margins lobed to divided, lobes or divisions oblong-ovate to triangular, entire, opposite or subopposite, occasionally alternate, apices rounded to acute or apiculate; petioles up to 37 mm long; cauline leaves progressively smaller upwards. Flowers axillary, 1 or 2 open per stem, faintly sweet-scented, nodding in early bud stage; flowering pedicels 20-65 mm long, ascending, dorsiventrally flattened especially where attached to flower, recurving in fruit except for upward curving apical portion. Calyx lobes 5, spreading, lanceolate, ± equal, 3.2-3.6 x 1.4-1.8 mm, acuminate, the two lower sepals slightly reflexed; margins white-ciliate. Corolla bilabiate, 5-lobed, limb 13.3-23.0 x 14.3-26.0 mm; lobes broadly oblong-obovate, falciform, outer sides longer than inner sides, 4.4-7.1 x 5.2-5.7(-7.9) mm, apices rounded, bases oblique; lateral lobes broadly obovate, emarginate, 5.4-7.1 x 5.2-6.8 (-8.3) mm, sides ± equal; lower lobe obcordate, 6.2-9.7 x 5.4-8.1(-11.4); upper lobes greyish magenta (14D6) with deep magenta veins or lines at base; other lobes similar in colour but without veining, all with scattered, dark purple, peltate glandular trichomes, especially on inner surface near base; tube shallowly cupped, deep magenta; bi-saccate, sacs oblong-ovate, rounded, 4-5 x 2.0-2.5 mm, mostly yellow, widely diverging, oil-secreting glandular trichomes within; central, stamen-bearing boss oblique, anticous portion 1.1-1.5 mm high, deep magenta, posticous portion 0.3-0.6 mm high, yellow. Stamens 4, erect, partly hidden; anticous filaments (twisted at base and appearing posticous) falciform, ±3.4-3.6 mm long, bases strongly curved, pubescent, trichomes clavate, purple; posticous filaments geniculate, thickened, 1.9-2.0 mm long, bend with protuberance ±1 mm from base, pubescent, trichomes clavate, purple; anthers ±0.50-0.80 mm, strongly cohering, grey; pollen orange (fading to yellow in pressed specimens). Ovary oblong-ovoid, laterally compressed contrary to septum, 1.6-1.7 x 1 mm; style ±1.6-2.0 mm long, reddish purple, curving forward in distal third; stigma capitate, surrounded by anthers; ovules ±35-45. Capsule ovoid to oblong-ovoid, 5.1-8.1 x 3.3-5.8 mm, exceeding sepals at maturity, base oblique. Seeds reniform, 1.0-1.2 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.