Variegata: Answers to key questions in Budd's Flora and Flora of North America leading to this species. 

	leaves 10-25 cm long; NOT [leaves 5-10 cm long]
	flowers 40-50 mm across; NOT [flowers 15-20 mm across]
	sepals usually 6; NOT [sepals 5, occasionally 10]
	stigmatic disk green, yellow, or occasionally reddened; NOT [stigmatic disk red]
	fruit slightly or not constricted below stigmatic disk; NOT [fruit deeply constricted below stigmatic disk]

Nuphar: Answers to key questions in Budd's Flora, Flora of Alberta and Flora of North America leading to this genus. 

	leaf venation essentially pinnate; NOT [leaf venation essentially palmate]
	flowers yellow; NOT [flowers white]
	perianth nearly globose at anthesis; NOT [perianth spreading at anthesis]
	sepals petal-like; NOT [sepals green]
	petals small, distinctly smaller than the sepals; NOT [petals large]
	stigmatic disk with margin entire to crenate or dentate, appendages absent; NOT [stigmatic disk with prominent, distinct, upwardly incurved appendages around margin]