Oat Hill Mine Trail

Hiding amidst the Tricolor monkeyflowers (Mimulus tricolor) there were a few tiny yellow Mimulus nasutus blossoms. Mimulus guttatus (yellow Bush Monkeyflower) and M. nasutus are evolutionary sister species. M. nasutus probably split from a central Californian M. guttatus population approximately 200500 kya - roughly corresponding to when M. nasutus shifted to self-fertilization.