Erect suffrutex, 0.45-1.25 m high; branches dark brown, semi-glabrous with scaly patches. Leaves petiolate, obovate-oblong, base cuneate, apex mucronulate, margins entire; velvety pubescent on both surfaces. Stipules leaf-like. Inflorescences of few-flowered cymes in axils of upper leaves; peduncles ± 5 mm long; pedicels shortly tomentose. Flowers 10 mm long, yellow. Calyx inflated, subglobose, ± 9 mm long, narrowed at mouth, 5-lobed at apex; stellate-pubescent. Petals shortly exserted from calyx, lobes recurved, narrowed into claw. Flowering time Aug.-Feb. Fruit a capsule enclosed in persistent perianth.
Like H. hyssopifolia but leaves grey-green-velvety, oblanceolate, margins usually entire and flowers often deep yellow.