Herbs to 1.5 dm, branched, the stems slender, angular, sparsely hairy. Leaves sessile, usually opposite, occasionally 4-several per node, lanceolate, ovate lan-ceolate, to 2 cm long, to 0.4 mm wide, the lateral veins few, vague, the blades stiff, scabrid above, otherwise glabrous, glabrous beneath, the margin revolute. Inflorescences with heads to 1 cm wide. Flowers white. Fruits to 3 mm long, glabrous below the line of dehiscence, pubescent above, the horns to 2 mm long, unequal, pubescent, the seeds oblong, ca. 0.5 mm long, with 2 diagonally crossed grooves on the ventral surface.
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