Deparia petersenii
Deparia petersenii (Kunze) M. Kato (incorrectly known as Athyrium japonicum or Diplazium japonicum), was known in 1950 only from the Kohala Mountains on Hawai'i. Now it has invaded all the islands. It has spread rapidly and widely along trails, roadsides, stream banks, and secondary forest floors and has extended its range along the edges of the native forest and into the forest floor itself. Deparia petersenii, native to the tropical and subtropical regions of eastern Asia, was first collected in Hawai'i in 1938 (Skottsberg 3179, BISH). It is an aggressive, fast-growing weed that often volunteers in gardens and is sometimes cultivated. It has also naturalized in the southeastern United States, southeastern Brazil, and the Azores.
