This creeping perennial is a long way from home. It came here in the 19th century, from N. America, to many gardens from which it has made its escape into the wild and hybridised with Mimulus guttatus (Monkeyflower). This plant is a creeping perennial which has erect, stout stems which bear three to seven yellow flowers in each leafy, stalked spike from June to September. The two-lipped flowers are 25-45mm across, with the open mouth, heavily blotched with red on the throat, being a perfect place for pollinating insects to land. This plant is found in wet places and belongs to the family Scrophulariaceae.
I found this plant and photographed it at 5-mile point, Co Wicklow in 1978.
If you are satisfied you have correctly identified this plant, please submit your sighting to the National Biodiversity Data Centre