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Herb, annual, delicate, with slender taproot. Branches erect to decumbent from base. Leaves mucronate to shortly caudate, often fleshy, 10–20 (–35) mm long, 0.5–1 mm wide, usually glabrous. Stipules usually acute, rarely acuminate, frequently unevenly furcate, 1.5–2.5 (–3) mm long, connate for about 33% of their length. Inflorescence few-to many-flowered, lax, with dense glandular hairs 0.1–0.2 mm long, rarely almost glabrous. Pedicels about twice the length of sepals. Sepals oblong-lanceolate, 1.5–2 mm long (mostly 2.5–3 mm long in fruit); basal spots absent. Petals (1.6–) 1.8–2 (–2.5) mm long, white or pale to bright pink, with tips darker. Stamens 2 or 3, rarely more. Capsules subglobose, 2.5–3 mm long, about equal to sepals. Seeds obliquely pyriform to lacrimiform, 0.45–0.5 mm long, dark brown, grey-brown or blackish, metallic-iridescent, smooth to colliculate or papillate, wingless.
Herbs annual. Stems ascending, 5--15 cm tall, slender, glandular pubescent. Leaves not or rarely fasciculate, 5--20 × 0.3--0.5 mm, apex obtuse; stipules not silvery, triangular, rarely lanceolate, short. Cymes sparse, small; bracts reduced. Pedicel slender. Sepals oblong-ovate, 1.5--2.5 × ca. 1 mm, apex obtuse. Petals lilac, rarely white, oblong-elliptic, shorter than sepals. Stamens 2 or 3. Capsule ovoid, 1.5--3 mm, ca. equaling calyx, valves purple-black at maturity. Seeds dark brown to black, ovoid, ca. 0.5 mm, unwinged. Fl. May--Jul, fr. Jun--Sep. 2n = 18.
