Flora Reipublicae Popularis Sinicae, volume 8
Billeder af nordens flora (1917) (19748839954).jpg
Finnish Biodiversity Information Facility
Portál informačního systému ochrany přírody
The IUCN Red List of Threatened Species 2022.2
Taxonomy database of the U.S. National Center for Biotechnology Information
Global Biodiversity Information Facility
United States Department of Agriculture Plants Database