Stems to 20 cm long, simple or sparsely branched. Leaves of branches: lamina divergent, 4-12 mm long, often twisted, acute, deep green; margins scabrid to almost smooth; nerves 5-9, flattened; grooves open, becoming almost closed towards apex; auricles tapering, 2-4 mm long, entire or lacerated; lamina of primary-stem leaves 7-16 mm long. Flowers terminal; pedicels 3-5 mm long. Sepals and petals 6-7 mm long, white with brown midrib. Stamens 5 mm long. Pistil 6 mm long, slender. Capsule 4-5 mm long, verrucose; tubercles rounded, to c. 0.3 mm long. Seed 4 mm long, finely reticulate.