Dianthus superbus longicalycinus1; a Japanese plant that flowers in summer and autumn. It is a member of the dianthus family and is pink and white in colour (though some variants are scarlet or purple), with patterns similar to those of the carnation. It is native to the Japanese town of Hiratsuka, and serves as the emblem of Kyoto and the Finnish Oulonko Biological Station. Also one of "the seven flowers of Autumn", and a popular subject in haiku and classical poetry.

1 Its Japanese name is Nadeshiko, literally "pretty girl".

http://www.geobop.com/Symbols/plants/flowers/world/japan/2/