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Annual or biennial taprooted herb. Stems suberect or erect, densely covered in glandular hairs above, (3)-8-20 cm long. Lvs not fascicled, somewhat fleshy, linear, mucronate, the lower glabrous, the upper with glandular hairs, (3)-5-12-(15) × 0.5-0.8 mm. Stipules greyish, not silvery, shortly connate, not forming a sheath, triangular to ovate, acute, 2-2.5 × 1-1.5 mm. Infl. a racemoid monochasium, many-flowered. Pedicels 1.5-3 mm long, < sepals. Sepals with glandular hairs, obtuse, 2.5-3.5 mm long; margins scarious. Petals white or pink, < sepals. Stamens (0)-2-5-(8). Capsule < sepals. Seeds ovate, brown, finely papillate, 0.4-0.5 mm long, not winged.
Slender perennial with many, much-branched, glandular stems up to 0.23 m long. Leaves 12-15 mm long, glandular, awned; stipules triangular. Flowers 2 mm in diam., in elongated, unilateral cymes; sepals densely glandular, a little longer than capsule; petals pink, ± as long as sepals. Flowering time summer. Seeds cuneiform, wingless, brownish.
Annual or biennial, with slender stems, 50-250 mm tall, from a slender taproot. Leaves opposite, without axillary tufts, linear. Flowers in open, glandular-hairy cymes, entirely white, or pink with white bases, sepals 2-3.5 mm long. Seeds not winged, pale greyish brown.
