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Slender annual herb up to 40 cm high. Stems glabrous, simple to much-branched at base. Stem lvs always alternate, glabrous, narrowly elliptic-obovate to linear, usually narrow-obovate at base of stem, acuminate, 1-veined, entire, (1)-3-15-(20) mm long; lvs subtending infl.-branches single, lanceolate, < stem lvs. Infl. of few to numerous fls in a diffuse compound dichasium; sepals narrow-ovate, long-acuminate, often sparsely glandular, ciliate, 3-4 mm long, sometimes ± = but usually > capsule; petals yellow, somewhat > to almost 2× as long as sepals, 3.5-6 mm long; styles free ± to base. Capsule glabrous, subglobose, dehiscent, 2-2.5 mm diam.; seeds ± elliptic, shiny light brown, c. 1 mm long.
Glabrous annual; stems erect, unbranched or few-branched from base, to 50 cm long. Leaves alternate, linear to narrowly elliptic, 7–20 mm long, acute. Inflorescence a lax cymose panicle; pedicels slender, 2–14 mm long. Sepals narrowly ovate, 3–4 mm long, glandular toothed or ciliolate. Petals narrowly obovate, 5–6 mm long, yellow. Anthers yellow. Styles connate only at base. Capsule 2–3 mm diam. Seeds c. 1 mm long.
