''Crepidiastrum platyphyllum'', commonly called ''wadan'' (ワダン), is a species of flowering plant in the family

Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Commonly referred to as the aster, daisy, composite, or sunflower family, Compositae w ...

. It is native to

South Korea South Korea, officially the Republic of Korea (ROK), is a country in East Asia, constituting the southern part of the Korea, Korean Peninsula and sharing a Korean Demilitarized Zone, land border with North Korea. Its western border is formed ...

and

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

. It is the northernmost member of its genus. In Japan, it is found along the Pacific Coast in the

Chiba Chiba may refer to: Places China * (), town in Jianli County, Jingzhou, Hubei Japan * Chiba (city), capital of Chiba Prefecture ** Chiba Station, a train station * Chiba Prefecture, a sub-national jurisdiction in the Greater Tokyo Area on ...

, Kanagawa, and Shizouka prefectures, and in

Tokyo Tokyo (; ja, 東京, , ), officially the Tokyo Metropolis ( ja, 東京都, label=none, ), is the capital and largest city of Japan. Formerly known as Edo, its metropolitan area () is the most populous in the world, with an estimated 37.468 ...

. Its natural habitat is on rocky or sandy seashores, where it is adapted for dry, sunny conditions. ''Crepidiastrum platyphyllum'' is a perennial species that produces yellows heads of flowers in late summer and fall.''Crepidiastrum platyphyllum''
at Prof. Summer's Web Garden It is similar to ''

Crepidiastrum lanceolatum ''Crepidiastrum'' is an Asian genus of flowering plants in the family Asteraceae The family Asteraceae, alternatively Compositae, consists of over 32,000 known species of flowering plants in over 1,900 genera within the order Asterales. Co ...

'', but can be differentiated by its larger basal leaves and wide, thick cauline leaves.

References

{{Taxonbar, from=Q15565607 platyphyllum