Reseda luteola

Erect perennial, to 150 cm high; glabrous. Leaves simple, decurrent, to 15 cm long; rosette leaves oblanceolate, more or less petiolate, margins sometimes undulate or slightly toothed near base; upper leaves linear-lanceolate to narrowly ovate, sometimes apiculate. Bracts persistent; pedicels 1–3 mm long; sepals 4(–5), ovate-elliptic, 1–3 mm long, persistent; petals 3 or 4, pale yellow, larger petal usually 5–7-lobed, to c. one-third of petal length, lobes broad, variously incised, other petals 1–3-lobed; stamens 10–32; filaments persistent. Capsule subglobose, 3–4 mm long, 3-toothed, deeply furrowed, summit usually open; seed smooth, shiny. Flowers most of year.