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Reseda luteola Linn., Sp. Pl. 448. 1753. Boiss., Fl. Or. 1:434.1867; Mueller, l.c. 202; Yeo in Tutin et al, Fl. Eur. l.c. 347; Coode in Davis, Fl. Turk. 505; M. Zohary, l.c. 338.
Reseda dimerocarpa Rouy & Fouc.Reseda pseudovirens Firv.
An annual or a biennial, 45-75 cm tall. Stem striate, glabrous, fistular when old. Leaves 3-8.5 cm long, 5-12 mm broad, linear to oblong-lanceolate, entire. Flowers yellow, in spicate racemes, 10-26 cm long; bract c. 3 mm long, up to 4 mm in fruit, lanceolate, persistent, margin membranous. Sepals 4, c. 4 mm long, ovate to oblong, persistent. Posterior petal 5-10-fid; appendage c. 1/3 the size of the petal, 2-nerved. Filaments persistent. Capsule 3-5 mm long, erect, subglobose, with 3 prominent stigmatic lobes. Seeds c. 1 mm long, glabrous, brownish-black, glossy.
Fl.Per.: May June.
Type: Described from Europe, Hb. Linn. 629/1 (LINN).
Distribution: SW. & C. Europe, SW. & C. Asia, N. Africa and Eastern USA.
‘Dyers weed’ is an adventive plant and not very common here. Native to Europe, where it grows in waste places and is also cultivated for the use of a yellow dye, luteolin.
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