''Fraxinus chiisanensis'' is a species of flowering plant in the family
Oleaceae
Oleaceae, also known as the olive family, is a taxonomic family of flowering shrubs, trees, and a few lianas in the order Lamiales, It presently comprises 28 genera, one of which is recently extinct.Peter S. Green. 2004. "Oleaceae". pages 2 ...
, native to South Korea.
With only about 20,000 mature trees found in nine locations, it is assessed as Endangered due to severe population fragmentation, and some logging pressure.
In spite of its Endangered status, it is still dominant in those streamside mountain forests where it does occur.
References
chiisanensis
Endemic flora of South Korea
Plants described in 1929
{{Oleaceae-stub