Softly hairy, densely leafy shrub to 2 m. Leaves linear-deltate, ascending-incurved, imbricate. Flowers in large, rounded heads sometimes loosely grouped in corymbs, whitish.
Usually 1 m high (occasionally 1-5 m), robust, with villous branchlets. Leaves sessile, erect-spreading, incurved, the upper 4-5 mm long, oblanceolate, linear-oblanceolate or oblong-lanceolate, convex and bluntly keeled on the dorsal surface, convex and with a prominent median vein on the ventral surface, ciliate, usually ± villous on the dorsal surface; lower leaves often appressed and glabrous, occasionally linear-oblong. Flower-heads terminal, 1.5-2 cm long, globose, subtended by leaves; receptacle villous. Bract leaf-like, tapering to both ends, villous on the dorsal surface, reaching the tips of the petals or almost so. Bracteoles oblanceolate-linear, tapering from the middle downwards, villous on the upper half of the dorsal surface, reaching well above the middle of the petals. Calyx-lobes 4-5 mm long, linear, acute, villous on the upper half of the dorsal surface. Petals about 6-5 mm long, linear, very obtuse, tapering in the lower half, with prominent keels tapering from well above the middle to near the base. Anthers scarcely 1-5 mm long, ovate-oblong. Ovary 3/4 inferior, villous on the upper part: ovules attached to the upper half of the chambers. Seeds about 3 mm long, convex and slightly striate on the dorsal surface, black.