Linaria vulgaris
 
Yellow Toad-Flax

Stamens and Pistil, Side B

Hudson Bay Trout Pond, 1.5 Miles East of Hudson Bay
01-August-2021

There are four fertile (anther bearing) stamens.  Two of the stamens are longer than the other two, an arrangement known as didynamous.

Vulgaris: Answers to key questions in Budd's Flora and Flora of Alberta leading to this species. 
plants perennial with extensive rootstocks; NOT [plants annual]
cauline leaves linear to linear-lanceolate; NOT [cauline leaves ovate to lanceolate]
cauline leaves narrowed to a petiole-like base; NOT [cauline leaves clasping at base]
flowers 2-3 cm long; NOT [flowers 3-4 cm long]
flowers yellow and orange; NOT [flowers white, pink or purple]

 

Linaria: Answers to key questions in Budd's Flora and Flora of Alberta leading to this genus. 
leaves not all basal
flowers in terminal racemes; NOT [flowers axillary]
corolla spurred at the base
only two or four stamens anther-bearing, others sterile or absent; NOT [five anther bearing stamens]

 

Scrophulariaceae: Answers to key questions in Budd's Flora  leading to this family. 
herbs; NOT [shrubs or trees]
plants green or with some chlorophyll; NOT [plants parasitic or saprophytic, without chlorophyll]
plants not aquatic
stems not square
leaves not bearing bladders
flowers not in heads or spikes; NOT [flowers in long or short spikes], NOT [flowers in heads or in form resembling a head]
flowers with two floral rings
petals wholly or partly united forming a tube or bell
corolla irregular; NOT [corolla regular]
ovary superior; NOT [ovary inferior]
fruit a many-seeded capsule; NOT [fruit with 4 nutlets]