Trailing, leafy, perennial herb, up to 0.5 m high, rooting at nodes. Leaves alternate, spreading, oblong, 100 x 15-20 mm, apex acuminate, margins purple or red; sheath with purplish longitudinal stripes, bearded at mouth. Inflorescence in axils of uppermost leaves, piercing leaf sheaths. Flowers: mauve, open in morning and closed in afternoon. Sepals 3, free. Corolla deep purple to blue; tube curved; lobes, patent, ovate. Stamens 6; filaments inserted in corolla throat, covered with dense purple hairs; anthers basifixed, with locules curved around discoid connective. Ovary pilose, 3-locular, with 1 or 2 axillary ovules in each cell; style exserted, filiform; stigma shallowly cup-shaped, with 3 erect, glandular, papillate lobes. Flowering time Dec.-Feb. Fruit an obovate-trigonous capsule, rostrate, hairy. Seeds oblong-ellipsoid.
Perennial with trailing leafy stems. Leaves alternate, spreading, oblong, 100 x 15-20 mm, apex long-acuminate, base narrowed into a sheath, margin purple or red. Inflorescences sessile. Capsule hairy. Flowers deep purple.