most common species of monkey-flower that I have encountered is simply called
Yellow Monkey-Flower (Mimulus Guttatus). I found many examples of this species
growing on wet, mossy cliffs along the Oregon Coast and in the Coast Range
Mountains. In the Willamette Valley, these plants are common along streams and
ditches. The name ‘monkey flower’ originates from the grinning, ape-like faces
of the flowers.