Corolla bright blue throughout or with the median lobe dark blue or blue-purple; or corolla pale mauve with the median lobe violet or dark blue, or white and blue; tube 6.5–8.5 mm long and c. 4 mm in diameter; lateral lobes 9 × 4–5 mm, median lobe c. 13 mm long, all ciliate; corolla limb spherical when in bud, glabrous.
Calyx 3–5(6) mm long and 3–5 mm in diameter at the apex of the lobes, subturbinate, usually glabrous, rarely with some hairs at the base; calyx lobes 1–1.5(2.5) mm long, shorter than the tube or nearly absent, triangular or shortly triangular-oblong, subacute or rarely rounded.
Cymes 1–5-flowered, arranged in (4)5–8 opposite pairs in a loose terminal panicle up to 25 cm long, indumentum similar to that of the leaves; peduncles divaricate or erect-patent, very slender, the lowermost 4.5–8.5 cm long; pedicels of the dichotomies up to 8 mm long.
A spreading or bushy shrub 2–6 m tall, or sometimes a slender tree up to c. 9.6 m tall; old branches with a brown or grey rough bark, glabrous; young branches appressed hairy.
Fruit 8–10 mm long, coppery-red (immature?).
Anthers c. 1.25–1.75 mm long.