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Corolla variable in colour, green to greenish-white except for the median bright blue lobe, or pale blue, or pale blue and yellow-green, or white with the lateral lobes light green and the median lobe purple, or 4 lobes pale muddy blue and the median lobe royal-blue, or 4 lobes greenish-mauve and the median lobe violet, or green without and brownish within; corolla tube 5–6 mm long, corolla lobes ciliate; limb of corolla bud 5–6 mm in diameter, subspherical, glabrous or subglabrous to ± densely hairy.
Calyx pale green, red in the upper part when fresh, red-purple on drying, (4)4.5–6 mm long and c. 7 mm in diameter, obconical-campanulate, subglabrous to ± appressed-hairy; lobes 3–4 mm wide at the base, rounded or oblong and obtuse, ciliate.
Inflorescence a terminal, pubescent panicle, 7–23 cm long, formed by opposite 2–5-flowered cymes, sometimes with 2–3 additional cymes in the axils of the uppermost leaves.
Stems few to many, erect, unbranched or occasionally somewhat branched, usually with a ± dense indumentum of spreading, ± rigid, short hairs.
The uppermost cymes subtended by foliaceous sessile bracts; the lowermost bracts up to 6 × 2 cm.
Perennial herb or suffrutex 25–80(100) cm tall, from a long creeping woody rootstock.
Anthers c. 2 mm long, yellow turning brown; filaments mauve to purple.
Peduncles of the lowermost cymes up to 5.5 cm long.
Style and stigma mauve to purple.
