Oenothera glazioviana, a
biennial herb introduced from Europe, grows wild in various
districts, seasides, or riversides, rising to 0.8-1.5m in height.
Stems are with stiff hairs, the bases of which are swelling and
tinging dark red. Leaves are 6-15cm long, 2-4cm wide, ovate-like
lanceolate, with tips pointed and margins having shallow wavy
serrations. Flowers, yellow, 6-8cm in diameter, singly set
themselves at axils with four broad petals. Bloom time: