⚠ Version 1 of The Plant List has been superseded.

This name is in version 1.1 of The Plant List, record gcc-72845, with some changes.

Cirsium tanakae f. obvallatum (Nakai) Makino is a synonym of Cirsium oligophyllum (Franch. & Sav.) Matsum.

This name is a synonym of Cirsium oligophyllum (Franch. & Sav.) Matsum..

The record derives from TICA which reports it as a synonym (record 5F10D1A6-83EA-4355-8192-0425105BC5D4) with original publication details: Ill. Fl. Nippon: 21 (1940) 21 1940.