Oenothera biennis,
a biennial herb originating in North America, grows wild on
roadsides, wastelands, or riversides. Stems branch well at lower
portions and rise to 0.5-1.5m, with hairs facing upward. Leaves are
long, oblong, and lanceolate, with sharp tips and shallow serrations
on the margins. Flowers, yellow, measure 2-5cm in diameter. Capsules
are cylindrical, 2-3cm in length. Bloom time: June-September.
Wild plants in and around Shimane
島根とその周辺の野生植物