Panarctic Flora


3601 Caltha L.


Notes: Deyl and Soják (1970) accepted the genus Thacla. In a phylogenetic study, Schuettpelz and Hoot (2004) found its type species - Caltha natans (= Thacla natans) - to nest together with the northern and southern hemisphere main branches of Caltha. In view of the appreciable variation in Caltha, especially in the southern hemisphere, we do not recognize Thacla.

Higher Taxa