Please note: all the names entered in IPNI in 2019 have now been added to WCSP. The records for these names are still incomplete and all 4000 are currently being edited. All these newly added names are expected to be complete by April. Thanks for your understanding.

Kew.org

World Checklist of Selected Plant Families (WCSP)

Campanula declinata Moench, Suppl. Meth.: 187 (1802).

This name is a synonym.

Accepted Name:	Campanula americana L., Sp. Pl.: 164 (1753).
Family:	Campanulaceae
Original Compiler:	T.Lammers & R.Govaerts