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Leaves inconspicuous, up to 3·5 x 1–1·5 mm., sparsely denticulate; upper leaves lanceolate, acute, erect; lower leaves often ovate or rounded, sometimes obtuse, spreading or reflexed.
Flowers in lax, up to 15–flowered, one–sided racemes; pedicels up to 10(–16) mm. long; bracts similar to upper stem leaves; bracteoles minute, at the base of the pedicel.
Corolla 6–9 mm. long, blue, with two bumps in the mouth of the tube, split to c. 0·4 mm. from the base on the back, sparsely papillose inside on the bottom of the tube.
Anther–tube 1·2–1·8 mm. long, shortly pubescent on the back of the upper thecae, the two lower anthers each with a tuft of hairs and a hyaline appendage at the apex.
Filaments linear, pubescent at the base, connate for most of their length, attached to corolla–tube at the very base only.
Capsule c. 10–nerved, glabrous or almost so with 2 valves ± 1 mm. long, inferior part of capsule 2–3 mm. long.
Calyx–lobes narrowly triangular to subulate, erect, 1–3 mm. long, with 1–2 pairs of teeth near the base.
Seeds elliptic–oblong in outline, compressed, ± 0·4 mm. long, almost smooth, brown.
Stem not or sparsely branched, angular, very narrowly winged, purplish below.
Hypanthium obovoid to subglobose, c. 10–nerved, glabrous or almost so.
Annual erect glabrous herb, 15–40 cm. tall.
Ovary subinferior.
