Nuphar variegata
 
Yellow Pond-Lily

Flower Stage 2 - Near Sepal Removed

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

The near sepal has been removed from this specimen to expose the interior of the flower.  Note the sepals are petal-like. The petals are originally erect but become divergent as the flower matures. The stamens are originally erect but become recurved as the flower matures.

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]