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A herb. It can grow from seed each year or live for a few years. It can be erect or lie over. It grows 10-60 cm high. The stem can form roots at the lower nodes. The stems are triangle shaped and with wings. The leaves are 2-5 cm long by 1-2 cm wide. They are narrow and taper to the tip. The flowers are in long loose groups in the axils of leaves or at the ends of branches. The fruit is a narrow cone shaped capsule. The seeds are oval and 0.4 mm long.
Leaves up to 20–50 x 3–20 mm., linear or narrowly elliptic to ovate, narrowing upwards, acute to obtuse at the apex, attenuate to cuneate below, often with an up to 5 mm. long petiole–like base, serrate–crenate, glabrous or rarely pubescent; at least the midvein prominent beneath.
Flowers in long lax terminal and axillary leafy racemes; pedicels up to 5–13 mm. long, glabrous, papillose or pubescent; upper bracts linear to narrowly elliptic, longer than or rarely equalling pedicels; bracteoles 0·3–0·8(2) mm. long, at the base of the pedicel.
Calyx–lobes narrowly triangular to subulate, ± erect, spreading, or recurved in fruit, 1·2–3·6(5) mm. long, entire or rarely with a single tooth at the margin, glabrous or rarely ciliate.
Anther–tube 0·8–2 mm. long, short pubescent on the back at least near the apex or rarely glabrous; the two lower anthers each with a tuft of hairs and a hyaline appendage at the apex.
Corolla 4–11 mm. long, blue with darker markings, split to 0·1–1 mm. from the base on the back, glabrous outside, papillose or short pubescent inside on the bottom of the tube.
Capsule narrowly obconical to subspherical, c. 8–nerved, glabrous or rarely pubescent, with 2 valves 0·6–1·2 mm. long, inferior part of capsule 2·4–6 mm. long.
Seeds elliptic in outline, compressed, 0·35–0·45 mm. long, ± distinctly reticulate to finely striate, brown.
Stems often rooting at lower nodes, sparsely branched, triangular and broadly winged, usually glabrous.
Filaments linear, at least the two lower pubescent below, attached to the corolla–tube at the base.
Hypanthium narrowly obconical to subspherical, c. 8–nerved, glabrous or rarely pubescent.
Annual or short–lived perennial, erect, ascending or decumbent herb, 10–60 cm. tall.
Ovary subinferior.
