Stems 5–30 dm. Branches ± thorn-tipped; twigs densely strigose and with minute, branched trichomes. Leaves: blade linear, 7–25(–35) × 1.3–2 mm, coriaceous, base cuneate, margins strongly revolute, touching midvein, apex acute, mucronulate, abaxial surface hidden, adaxial surface usually sparsely sericeous, sometimes glabrate, trichomes appressed, to 0.4 mm; midvein 0.5–1 mm wide, flat. Pedicels 2–6 mm, strigose and with minute, branched trichomes. Flowers: hypanthium and calyx tube 1.5–3.5 mm; sepals becoming reflexed, triangular, 3–6 × 1.5–3 mm, sparsely sericeous and with minute, branched trichomes abaxially; petals white, 5–11 × 4–7 mm, claw 3–4.5 mm, blade ovate, round-obovate, or deltate-ovate, margins ± erose; filaments 3.5–8 × 2–2.5 mm; anthers 2–4 mm; styles 1–1.2 mm. Capsules ovoid, 9–13 × 5–6 mm. Seeds 3–5 mm.
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