Laxly caespitose perennial, 10-15 cm, with many branched woody stems, covered with leaf bases or withered leaves, sterile shoots densely leafy; flowering stems erect, glandular or glabrous, few-leaved. Leaves fasciculate, brownish or green, 10-15 mm, setaceous or subulate, keeled below, apex spiny, ± ciliate a base. Pedical longer than the calyx, glandular or glabrous. Bracts lanceolate, white scarious margins. Sepals 3-5 mm, ovate, acuminate, slightly convex, with a minutely ciliate, scarious margin, glandular-pubescent or glabrous. Petals white, obovate, ½ to 2 times the length of the sepals, with undulate margins. Capsule longer than the calyx, dehiscing by 6 teeth. Seeds winged at the back.