Not an accepted name (status: unknown). The accepted name is Petasites frigidus var. frigidus 1845.

Petasites frigidus var. sinuolatus Korobkov, 1987 2% complete

No common name

(1987). Arktichesk. Fl. SSSR 10

There is no corrections for Petasites frigidus var. sinuolatus yet.