noun
Chokai thistle; Cirsium chokaiense
A species of thistle native to Japan, named after Mount Chōkai. Botanical term.
チョウカイアザミは鳥海山周辺で見られる固有種です。
The Chokai thistle is an endemic species found around Mount Chōkai.
Named after Mount Chōkai (鳥海山), where the plant is found. The derivation is straightforward from the place name and 薊 (thistle).