Erect shrub to 3 m high; branches moderately tomentose with branched hairs and sometimes minute glandular hairs. Leaves sessile or subsessile, ovate to narrow-ovate, mostly 25–75 mm long, 8–20 mm wide (juvenile leaves often much larger and petiolate), acute or obtuse, margins flat, virtually glabrous. Inflorescences panicle-like, dense, leafy. Flowers on sparsely pubescent pedicels 2.5–6.5 mm long; calyx campanulate, 3–4 mm long, virtually glabrous; corolla 10–12(–14.5) mm long, virtually glabrous, white with purple striations, lobes ovate-truncate to linear, 4–5.5(–9) mm long, spreading; stamens 2–4 mm long. Capsule more or less globose, 4–5 mm diam.; seeds 2.4–3.5 mm long, pitted, brown. Flowers mainly spring and summer.