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Dahlias by Flower Name - Dahlia Divas
Dahlia Classification - Swan Island Dahlias
Dahlia Flower Types: A Guide to Groups and Classification - Gardener's Path
Dahlia Finder
Classifications – Dahlialama
Plant ID Pal - Purdue University
Classification - National Dahlia Society
Dahlia Identification Cards - Sccflowerfarm
dahlia - KPU Plant DB - Kwantlen Polytechnic University