Branchlets rigid, glabrous except for coarse hairs at the base of the leaves. Leaves 5-7 mm long, alternate, erect-spreading, crowded, slightly incurved in the upper half, lanceolate-ovate, ovate-lanceolate or elliptic-oblong, acute, rounded at the base, concave and glabrous above, with long coarse and rigid hairs on the margin, stoutly keeled, gibbous behind the apex, with rigid coarse hairs on the keel, with small scattered glands beneath. Flowers in terminal clusters. Peduncles 1.5-2 mm long, sparsely hispid, with conspicuous bracteoles on the lower half. Sepals 2.5-3 mm long, oblong-lanceolate, acute, ciliate, with an obtuse sparsely pilose keel on the upper half. Petals 6-8 mm long; blade narrowly ovate, obovate, elliptic or oblong-ovate, obtuse; claw twice as long, filiform, villous. Stamens with villous filaments. Staminodes 5.25-6 mm long, adnate to the lower half of the petals; blade linear-oblong or narrowly obovate-oblanceolate, obtuse; claw twice as long, filiform, villous. Ovary glabrous, with 3 carpels bearing oblong processes. Style glabrous.
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Single-stemmed, rigid, coarse, leafy shrub to 20 cm. Flowers in dense heads, white or purple. Fruits 3-chambered.