Perennial herb or subshrub 30-70 cm tall, woody at base; lower stems densely and minutely white-velutinous, uppermost internodes with ± numerous spreading glandular hairs, sparsely to densely puberulent, sometimes with scattered appressed-strigulose hairs. Leaf buds densely white-strigulose and/or white-velutinous. Leaves lanceolate, narrowly ovate-elliptic or ovate, 2.8-10.5 x 1-3 cm, base attenuate or cuneate, apex acute or rarely obtuse, apiculate, surfaces soon glabrescent except for margin and midrib beneath sparsely strigulose; lateral veins 4-5 pairs; petiole to 15 mm. Inflorescence axillary in upper portion of branches, 1-3-flowered; peduncle 0-8 (25) mm long; bracts foliaceous, often much-reduced at upper nodes where typically linear or oblanceolate, 11-20 x 2-5 mm, often with scattered glandular hairs; bracteoles linear, oblanceolate or narrowly elliptic-lanceolate, 6-20.5 x 0.5-3.5 mm, spreading glandular-pubescent, veins strigulose; pedicels 0-4.5 mm long. Calyx somewhat accrescent; outer lobes equal, elliptic to ovate, 7-15.5 x 4.5-9.5 mm in flower, 12.5-20 x 9.5-13.5 mm in fruit, base rounded to acute, apex rounded to subattenuate, that of anterior lobe often minutely notched, external surface ± densely spreading glandular-pubescent, main veins also strigulose, internal surface puberulous, venation palmate or subparallel, prominent; lateral lobes lanceolate, 5-9.5 mm long in flower, 9-13 mm in fruit. Corolla 26.5-41.5 mm long, blue, mauve or lilac with paler tube, whole flower sometimes whitish at anthesis, lateral lobes eglandular-and glandular-pubescent externally, elsewhere glabrous; tube funnel-shaped or narrowly so, 13-18.5 mm long, basal 3.5-7.5 mm being 3.5-4.5 mm wide, rapidly to gradually widening to 5.5-10 mm at throat; limb in 4+1 arrangement; abaxial lobe 12-18.5 x 7.5-15 mm, offset by 3.5-7 mm; lateral lobes 10-16 x 7.5-14 mm; adaxial lobes as laterals but 6-10 mm wide. Stamens attached 4-5 mm from corolla base; filaments 16.5-25 mm long; anthers 3-4.5 mm; lateral staminodes 0.7-1.3 mm. Ovary densely puberulous in distal half; style glabrous; stigma 1.5-2.5 mm long. Capsule 14-17.5 mm long, puberulous mainly on beak. Seeds c.6.5 x 5 mm.
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Shrub, up to 0.8 m high, unarmed. Young branches white tomentose. Leaves ovate, ovate-lanceolate to linear-lanceolate. Flowers solitary, axillary. Calyx thickly glandular pubescent. Flowers yellow or pale mauve with white throat.