Nuphar variegata
 
Yellow Pond-Lily

Flower Stage 1 - All Sepals Removed

North of Highway # 3 on Silica Sands Road,
33 km East of Hudson Bay
10-July-2024

This specimen is still in bud.  Note the sepals (which are much larger than the petals) have been removed from this specimen. The petals are originally erect but become divergent as the flower matures. The stamens are also originally erect but become recurved as the flower matures. Note the yellow stigmatic disk.

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]