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Leaf blades 1.3–8.5 x 0.22–1.25 cm., linear-lanceolate to lanceolate, acute at the apex, cuneate or ± rounded at the base, sessile, ± thick, with thickened whitish margins and midrib, glabrous save for the margins and main nerve beneath or scabrid to pilose on both surfaces, the margins nearly always ciliate with short stiff hairs; stipule sheath united with petioles, 5–6 mm. long, ridged, hairy or shortly pubescent with 5–6 ciliolate setae 0.2–1.2 cm. long.
Capsule 3.5–5 x 2.5 mm., subglobose, crowned with the calyx lobes, opening right out, the valves joined only at the base, almost circular in outline, convex, 3.5 x 4 mm., glabrous, transversely wrinkled; septum persistent, shiny.
Corolla white, pink or blue; tube 6–7(13) x 3.5 mm. at the mouth, cylindrical to narrowly funnel-shaped, with a ring of hairs inside 2.5–3 mm. above the base; lobes 3–6 x 1.2–2.2 mm. oblong-lanceolate.
Flowers sessile in axillary and pseudoterminal (1)3–6-flowered clusters at many of the upper nodes, the apical 2–3 often run together to form a short spike-like inflorescence; bracteoles 7 mm. long.
Seeds dark brown to black, 3–3.6 x 1.5 x 1.3 mm., oblong-ellipsoid, shining, very finely reticulate, with a ventral groove and a conical yellowish basal appendage (elaiosome) 1.1–1.5 mm. long.
Calyx tube glabrous, oblong, 1.5 mm. long; lobes 2, 0.3–2 cm. x 0.8–1.8 mm., linear-lanceolate to lanceolate, similar to the leaves in texture and indumentum, ciliate.
Erect annual herb 17–60 cm. tall; stems ± simple or sparingly branched, 4-angled, bifariously shortly pubescent in the grooves.
Style exserted 1.5–6 mm., finely papillate; stigma capitate, c. 7 mm. wide.
Filaments 1–3.5 mm. long.
