Allegheny Monkeyflower [Mimulus ringens] found at Fletcher Park on 1 August 2015. It’s a member of the Figwort (Scrophulariaceae) family and Newcomb’s Wildflower Guide, pages 100-101 states that it blooms in summer and early fall in wet places. The book also states:
The throat is partially closed with a yellow-ridged palate, so that the flower somewhat resembles a grinning face.
USDA Plants Listing: Mimulus ringens