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Leaf blades 1.2–8 x 0.1–1.6 cm., elliptic-oblong to elliptic-or linear-lanceolate, acute to tapering acuminate at the apex, cuneate to rounded at the base, scabridulous above particularly near the margins, glabrous beneath; petiole very short or not developed; stipule sheath 1 mm. long, with 1–5 short fimbriae or colleters 0.2–0.5 mm. long, sometimes with bristly hairs.
Flowers heterostylous, in lax terminal or pseudo-axillary lax dichasia often running together to form ample panicles; pedicels 0.2–1(1.5) cm. long (up to 3 cm. in inflorescences reduced to 1 flower).
Perennial herb with erect scrambling or trailing stems 0.2–1.2 m. tall radiating from a woody rootstock; stems glabrous, with 2 raised lines on each internode below the stipules.
Corolla dark blue, or blue-purple to deep violet; tube 3–4.5 mm. long, hairy inside; lobes 1.8–3.2 x 0.8–1.5 mm., elliptic or oblong.
Calyx tube 0.6–1 mm. long, subglobose, glabrous; lobes 0.5–1 mm. long, triangular, keeled, glabrous or with ciliate margins.
Capsule 2–2.8 x 2.2–2.5 mm., globose, glabrous, obscurely 8-ribbed, scarcely beaked, crowned by the calyx lobes.
Style 3 mm. long in short-styled flowers, 4.5 mm. long in long-styled flowers; stigma lobes 1–3 mm. long.
Seeds brown, angular, c. 0.5 mm. long, hilum borne on one of the keels, reticulate.
A glabrous decumbent or straggling herb, stems about 2 ft. long, branched
Flowers deep blue
