The Skeleton flower, whose petals turn from white to translucent when it rains.
The Skeleton flower (Diphylleia grayi) is a white woodland blossom flower with large, umbrella-like leaves that grows in moist, colder climates and wooded mountainsides and they are found in Japan, China and the Appalachian Mountains in the US. Indeed, the white petals turn glass-like when they get wet due to their loose cell struture and not because the pigments are being washed out. When it rains, water fills up the cells in the petals, hence turning clear. However, when the petals dry out, they turn back to their original white color. There's no conclusive research as to whether this characteristic is beneficial or a bad thing for these beautiful flowers.
📷 Unknown (credit to owner)