Sand Eveningprimrose

This is probably 'Matsuyoigusa' or Sand eveningprimrose, though these flowers on the picture open even in the midday. The botanical name is Oenothera stricta.







There are many kinds of 'Matsuyoigusa' (about 80 in the world), and this is maybe 'Arechi-Matsuyoigusa'...

The name 'Yoimatsugusa' is commonly used, but not correct one. This name originates from a poem by Yumeji Takehisa (1884-1934):
待てど暮せど来ぬ人を　宵待草のやるせなさ　今宵は月も出ぬそうな
(Mate-do Kurase-do Konu Hito-wo, Yoimatsugusa-no Yarusenasa, Koyoi-ha Tsuki-mo Denusouna)


Japanese version of this article is: here!