About 50 cm high, much branched, with slender, minutely and sparsely pubescent or glabrous branchlets. Leaves mostly about 3 mm long, imbricate, erect-spreading, linear, obtuse, apiculate, trigonous, keeled from the apex down the ventral surface, glabrous. Stipules minute, attached to the base of the petioles. Flower-heads about 3 mm Wide, terminal, often clustered, surrounded but not exceeded by pale ciliate leaves. Bract and bracteoles alike, setiform, clothed with caducous hairs. Calyx-tube narrowly obconic, with caducous hairs, free in the upper cup-shaped part: calyx-lobes linear-lanceolate, with caducous hairs on the dorsal surface, reaching to the middle of the petals. Petals about 1.5 mm long, obovate, glabrous, with a median keel on the ventral surface. Anthers elliptic. Ovary with persistent hairs on the summit: styles connate except at the tips. Fruit dehiscing down two sides, 1-seeded.
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Like S. capitella but leaves oblong, 3-4 mm long.
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