Annual or perennial, erect to decumbent herb, 8–50 cm. tall, often purplish tinged towards the base.. Stem narrowly winged, glabrous or occasionally sparsely pubescent.. Leaves 7–15 mm. long, ± orbicular or triangular in outline, finely dissected into linear, acute segments, glabrous, subsessile or with a petiole up to 4 mm. long.. Flowers in lax leafy racemes or scattered in upper leaf-axils; pedicels 10–22 mm. long, glabrous; upper bracts usually tripartite, shorter than pedicels; bracteoles 0.5–1.5 mm. long, at base of the pedicel.. Hypanthium very short, broadly obconical or practically absent.. Calyx-lobes linear-subulate, spreading, 3.5–5 mm. long, entire, glabrous.. Corolla 7–12 mm. long, blue, often with white throat, split to 1–2 mm. from the base on the back, shortly pubescent inside, glabrous outside.. Filaments pubescent below and attached to the corolla-tube at the base.. Anther-tube 1.2–2 mm. long, shortly pubescent on the back or glabrous; 2 lower anthers each with a tuft of hairs and a hyaline appendage at the apex.. Ovary subsuperior.. Capsule with prominent valves 3–4 mm. long, much longer than the inferior part of the capsule.. Seeds elliptic in outline, compressed, ± 0.5 mm. long, very finely striate, brown.
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