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Annual, erect herb. Stems 5-10 (-35) cm, flexuose, branched, blunt-angular, the angles pale elevated lines, patently ± hispid-hairy. Leaves 5-20 by 1.5-6 mm, spirally arranged (sometimes almost distichous), sessile, oblong, sometimes elliptic, acute, mostly obtuse at the base, sparsely hairy (hairs especially along the midrib) or almost glabrous, margin thickened, undulate shallowly and remotely dentate. Flowers axillary and terminal. Pedicels 5-10 mm, filiform, hairy. Calyx lobes 5, 1.5-3 mm, linear to narrow-triangular, acute, outside sparsely patently hairy. Corolla 5-parted, segments linear acute about as long as the calyx lobes. Stamens 5, anthers 0.5 by 0.2 mm; filaments 0.8 mm, membranous, broad at the base, 3-lobed, the side lobes small, the middle lobe bearing the anther. Ovary 2-2.5 mm, bell-shaped to obconical, patently hispid-hairy (hairs up to 0.5 mm), top conical, apparently lengthening during anthesis to about 1.5 mm; style 1.5 mm, narrow-cylindric, thickened below the apex, with 3 short stigmatic lobes. Fruit 2-3 mm, obconic to bell-shaped, 5-nerved, valves 3, before opening forming a glabrous cone 1-1.7 mm high. Seeds ∞, compressed-ellipsoid, shining, brown, 0.5 mm.
Leaves 8–27 x 3–8 mm., alternate, sessile, lanceolate to narrowly ovate or ovate (the lowest only), acute, with cuneate to truncate base, ± hirsute; margin incrassate, undulate–dentate; midvein prominent beneath, lateral veins almost invisible.
Stamens with filament–bases usually narrowly triangular, sometimes slightly broadened, glabrous or sparsely and shortly ciliate; anthers 0·4–0·7 mm. long.
Annual erect herb, 6–35 cm. tall, with main stem usually distinct nearly to the top of the plant, hirsute with mixed hairs of different length.
Ovary 3–locular, semi–inferior; style c. as long as the corolla, slightly thickened just below the 3 short lobes, eglandular, glabrous below.
Inflorescence lax, ± pyramidal; pedicels 3–12(20) mm. long, hirsute with mixed hairs of different length, rarely glabrous.
Corolla 1·5–2·5 mm. long, ± pale blue or white, split almost to the base into linear–lanceolate lobes, ± hirsute outside.
Calyx–lobes 1–5–3 mm. long, usually abruptly broadened at the base, hirsute in lower part only.
Seeds 0·5–0·6 mm. long, elliptic–oblong in outline, compressed; testa almost smooth.
Capsule 3–locular, 10–nerved; valves 3, 1·2–1·6 mm. long.
Hypanthium hemispherical, 10–nerved, hirsute.
Branches usually numerous, spreading.
