Reseda lutea L.
Diagnostic description:
A hairless, erect to ascending annual or perennial, from 20 to 50 cm tall. Leaves pale green, deeply pinnately lobed, with 1 to 5 lobes; sometimes with each lobe further deeply divided. Flowers yellow, about 6 mm across, in slender, roughly conical, spike-like racemes; petals 6, the upper ones 2 to 3-lobed, the lower ones entire. Capsule more-or-less cylindrical, up to 12 mm long.
Distribution:
Local: Rare in Gibraltar. Found on Windmill Hill Flats.
Global: Found from north to south and western Europe, north Africa and south-west Asia.
Ecology:
Flowers from March, April, May, June to July.
Habitat:
Grows on cultivated and disturbed ground; waysides.