Ivy Toad Flax
Ivy-leaved toadflax (Cymbalaria muralis) is a perennial with small, ivy-like leaves and delicate, snapdragon-like purple flowers. It has a trailing habit and enjoys growing in walls, crevices, and rocky places.
Photo by Robert Flogaus-Faust, CC BY 4.0 <https://creativecommons.org/licenses/by/4.0>, via Wikimedia Commons