Herbs, 8–30 cm, glabrous. Stems erect, usually unbranched proximal to inflorescence, sometimes branched from decumbent base. Leaves: blade narrowly elliptic to oblanceolate or narrowly obovate or oblong, larger 5–18 × 1.4–3.1 mm, largest at midstem, reduced in size both proximally and distally, apex obtuse to acute. Inflorescences panicles. Pedicels 6–35 mm. Flowers: sepals broadly lanceolate to ovate, outer sepals 2–3 mm, inner sepals broader, shorter, margins of all or sometimes only of inner sparsely but conspicuously glandular-toothed, apex acute to acuminate; petals white or whitish, base yellowish, 2–5 mm, obovate; stamens 1 mm, anthers 0.2–0.3 mm; styles 0.5–1 mm. Capsules ovoid, 2–2.5 × 2 mm, fragile and subject to crushing when pressed; segments persistent on plant, septa margins ciliate. Seeds 1–1.5 × 0.6–0.8 mm. 2n = 16.
"Glabrous annual 1–3 dm, simple below, branched above into a dichasial cyme; lvs all or mostly opposite, oblong to obovate, 3–15 mm; pedicels very slender, terete, the lowest 10–25 mm, the upper shorter; sep glandular-ciliate; pet white with a yellow claw, 4–8 mm; staminodia tiny, triangular; fr ovoid-globose, 2–2.5 mm, fragile; false septa incomplete, long-ciliate; 2n=16. Native of Europe; intr. in disturbed sites from Nf. and N.S. to N.J. and Pa., w. to n. Mich. July–Sept. (L. pratense; Cathartolinum c.)"
|Fairy or purging flax, lin purgatif|