Marsh Marigold, White Marsh Marigold, Elkslip, Broad-leaved Caltha: Caltha leptosepala (Synonyms: Caltha biflora var. biflora, Caltha biflora var. biflora, Caltha biflora var. rotundifolia, Caltha leptosepala var. biflora, Caltha leptosepala ssp. howellii, Caltha leptosepala var. leptosepala) -
Western Marshmarigold, Yellow Marshmarigold, Yellow Marsh Marigold: Caltha palustris (Synonym: Caltha asarifolia) -