Plants annual, with minute, tuberous bodies; periderm absent. Stems 5-30 cm. Leaves: blades green or pink, not glaucous; basal leaves petiolate, blade linear (sometimes filiform), narrowly lanceolate, spatulate, or rhombic, 1-15 × 0.5-1 cm; cauline leaves sessile, blade linear and 0.5-4 cm, or perfoliate and 10 cm or less diam. Inflorescences 1-bracteate; bract 0.5-15 mm, leaflike. Flowers 2-12 mm diam.; sepals 1.5-4 mm; petals white or pink, 2-8 mm; ovules 3. Seeds 1-2.5 mm diam., shiny and smooth or with low tubercles, not pebbly; elaiosome 1-3 mm. 2n = 12, 24, 36, 48.