Linum corymbulosum Rchb.

A common spring annual with small yellow flowers. It grows in the plains and hills up to' 23C0 m.

Annual herb, 10-50 cm tall. Stem slender, erect, branched, glabrous to slightly hispid. Leaves alternate, linear to lanceolate, 1-3 cm long, c. 4 mm broad; margin scabrid. Flowers in lax, spreading corymbose cymes, ebracteate; pedicel 6-12 mm long, slender. Sepals free, persistent, 5-6 mm long, ovate, acuminate; margin scabrid, glandular. Petals obovate, as long as the sepals, entire, glabrous, contorted, yellow. Stamens 5; filaments c. 2.2 mm long, anthers elliptic-oblong, 1 mm long; Staminodes 5, slender, alternating with the stamens. Ovary ovoid; styles free, 2 mm long; stigma sub-capitate. Capsule sub-globose, c. 3 mm long, splitting into 10, 1-seeded cocci; seeds oblong, 1.5-2 mm long, reddish brown, shiny.

Annuals 10-30 cm tall. Taproot pale, slender. Stems simple, erect, glabrous or sparsely pubescent, corymbosely branched apically from middle or sometimes branched at base and decumbent. Leaves alternate, narrowly lanceolate, 1-1.5 cm × 1-2 mm, nearly glabrous, 1-veined from base, margin slightly denticulate, apex acuminate to obtuse. Flowers axillary or opposite a leaf, solitary or in broad cymes, homostylous. Pedicel subequaling leaves or slightly shorter, erect. Sepals lanceolate, 4-6 × 1-1.5 mm, 2 × as long as capsules, 1-veined, basal margin glandular-ciliate. Petals yellow, long obovate, 6-8 × ca. 2 mm, base gradually narrowed into claw, apex obtuse. Capsule pale yellowish brown, globose-ovoid, 2-3 × ca. 1.5 mm. Seeds pale yellowish brown, elliptic, ca. 1 mm. Fl. Jun-Aug, fr. Jul-Oct. 2n = 18.

Distribution: S. Europe. Mediterranean region, Canary Islands, E. Africa, Afghanistan, India and W. Pakistan.

Fl. Per. March-June.

Sandy and gravelly floodplains, flat areas in deserts or on low mountains. Xinjiang [Afghanistan, Kazakhstan, Pakistan, Russia; N Africa, SW Asia, Europe].

Linum corymbulosum là một loài thực vật có hoa trong họ Linaceae. Loài này được Rchb. mô tả khoa học đầu tiên năm 1832.

长萼亚麻（学名：Linum corymbulosum）为亚麻科亚麻属下的一个种。