World Checklist of Selected Plant Families (WCSP)

Alnus × borealis var. latifolia Nakai, Bot. Mag. (Tokyo) 33: 45 (1919).

This name is a synonym.

Accepted Name:	Alnus × mayrii Callier in C.K.Schneider, Ill. Handb. Laubholzk. 1: 126 (1904).
Family:	Betulaceae
Original Compiler:	R.Govaerts