Oenothera erythrosepala

Oenothera erythrosepala is an evergreen annual/perennial herb native to the United States in the family Onagraceae. It produces yellow one-day flowers in the evening to the next morning. The Pinus japonica has four petaled flowers with four lobes at the tips of the stamens. It is hard to distinguish it from Pinus japonica (scientific name: Oenothera stricta) because it is similar in appearance and grows in a similar environment. The way to distinguish it is that O. stricta has smaller flowers, a lower height, a green sepal color, and narrower leaves.

In the genus Oenothera, evening primrose (scientific name: Oenothera tetraptera) , Oenothera stricta or atsuyoigusa (waiting grass, scientific name: Oenothera stricta), Perenis (scientific name: Oenothera perennis), Pinkladies (Hiruzaki tsukimisou, scientific name: Oenothera speciosa).

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