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Leaves up to 5–40 x 4–30 mm., ovate to subreniform or rarely narrowly elliptic, narrowing upwards, obtuse to subacute at the apex, cuneate to cordate or rarely attenuate at the base, with a petiole up to 1·5–10(15) mm. long, ± crenate to pinnatifid, densely pubescent to glabrous on both sides or only the upper side pubescent.
Flowers in lax leafy racemes or rarely scattered in the upper leaf–axils; pedicels (10)20–45 mm. long, filiform, glabrous or pubescent; upper bracts linear to elliptic or rarely ovate, usually much shorter than the pedicels; bracteoles 0·1–0·8 mm. long, at or near the base of the pedicel, rarely absent.
Corolla 3·2–16 mm. long, blue to pale pink, split to 0·6–2 mm, from the base on the back, short pubescent to sparsely papillose inside, glabrous or pubescent on the lobes outside.
Anther–tube 0·6–1 6(2) mm. long, short pubescent at least on the back, or glabrous; the two lower anthers each with a tuft of hairs and a hyaline appendage at the apex.
Capsule ± obovoid, glabrous or pubescent with prominent valves 1·5–3·2 mm. long, about as long as or usually longer than the inferior part of the capsule.
Calyx–lobes very narrowly triangular, ± erect or spreading, (1·5)2–5(7) mm. long, entire, ciliate, ciliate–pubescent or rarely glabrous.
Filaments linear, at least the two lower pubescent below, rarely all subglabrous, all attached to the corolla–tube at the base.
Stem usually much branched, very narrowly winged or ribbed, sparsely to densely pubescent or occasionally glabrous.
Annual or short–lived perennial, erect to decumbent herb, 4–60 cm. tall, often purplish tinged towards the base.
Seeds elliptic to broadly elliptic in outline, ± compressed, 0·3–0·5 mm. long, very finely striate, brown.
Hypanthium broadly obconical, usually very short, glabrous or pubescent.
Ovary subsuperior to semisuperior.
