Diascia lewisiae K.E.Steiner

Annual herb, glabrous, simple or branching from the base. Stems up to 280 mm long, erect or ascending, tetragonal in cross-section (up to 2.0 mm on a side). Basal leaves few to many, rossulate or crowded, simple, petiolate, ascending, lamina 8-22 mm long, ovate to elliptic, apex rounded to acute, base attenuate, margins irregularly divided, divisions up to ca. 4 mm long, linear to deltoid, entire, acute to acuminate; petioles up to ca. 20 mm; stem leaves smaller, becoming reduced upwards, alternate, opposite or verticillate. Flowers axillary, 1-3 open flowers per stem, sweetly scented, nodding in early bud; pedicels 25-42 mm long, ascending, broadened and dorsi-ventrally flattened especially where attached to the flower, recurving in fruit. Calyx lobes five, more of less equal, ca. 2.5-3.0 x 1.2-1.3 mm, reflexed, ovate, acuminate, margins white ciliolate. Corolla bilabiate, limb ca. 11.5-18.0 x 13.5-19.0 mm; upper lobes ca. 3.5-4.5 x 4.5-6.0 mm, falciform-ovate, rounded, oblique, lateral lobes ca. 4.5-6.5 x 5.0-6.0 mm, ovate to widely ovate, rounded; lower lobe ca. 5.0-7.5 x 7.0-9.0 mm, broadly obovate and emarginate to obcordate, upper lobes reddish-purple, darker and with dark red lines at the base, other lobes similar in colour but lacking lines, glandular puberulent especially on inner surface near the base, trichomes with dark purple tips; tube ca. 2.0-2.5 mm long, portion at base of upper corolla lobes very dark purple, with two yellow spots (each ca. 0.5-0.8 x 0.2-0.3 mm) flanking the stamens and two smaller yellow linear spots (each ca. 0.2-0.4 mm long) between the larger spots and obscured by anthers or occasionally absent; tube below spots distended into two sacs, ca. 2.7-4.0 mm long and ca. 2.0-2.5 mm in diameter, oblong to obovate in outline, diverging and projecting slightly downward, tips bulbous, containing dense patches of trichome elaiophores, yellow with two purple streaks; central portion of tube invaginated to form a boss bearing the stamens, boss ca. 1.2-2.0 mm high on anticous side and ca. 2.5-3.0 mm high on posticous side, mostly dark reddish-purple except for wedge-shaped patch of yellow posticous to stamens, connected on posticous side to the upper lip by a septum. Stamens four, erect from the boss, partly enveloped by and touching the upper corolla lobes, anticous filaments (appearing posticous due to twisting of the bases), ca. 2.5-3.0 mm long, more or less straight except at the base, and with scattered, purple, clavate trichomes, posticous filaments (appearing anticous) ca. 2 mm, more or less straight, but with short, terete, forward projections near midpoint of filaments, projections covered with purple, clavate trichomes; anthers ca. 0.5-0.8 mm, strongly cohering, tilted slightly forward, yellow. Ovary ca. 1.5-2.0 x 1.0 mm, ovate in outline, style ca. 1.0-1.5 mm long, more or less straight, stigma surrounded by anthers, ovules 35-55. Capsule ca. 5.0-7.6 x 2.7-3.6 mm, ovate in outline, exceeding calyx at maturity; seeds 1.0-1.2 mm long, falciform in outline, dorsal surface ridged, ventral surface with outgrowths of the seed coat forming a cup-like structure with an oblong-elliptical opening.