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AJoiÈ}cCOT®ÌñNÅAw¼Í Oenothera biennisB
p¼Í Evening primroseB
Evening primrose belongs to the Onagraceae (the Evening primrose family).
It is a biennial herb that is native to North America. This herb was
introduced into Japan in late Meiji Era (about 100 years ago). Nowadays it
is naturalized in so many places, and grows on roadsides or stream banks.
It produces yellow flowers from evening to dawn. It is resemble to Large-
flower'd evening primrose, though it is defined that the hairs on stems and
fruits are soft, not reddish at the bases and the petals do not turn in reddish
2009N0804úBeB(photo by Aya Nishizawa)