Oregon-Ahorn
Wetland vegetation types found on Mount Tamalpais include coastal riparian forests, wet meadows, and some marsh areas. Coastal riparian forest is predominant along the valley streams of Mount Tamalpais. Red and white alder ("Alnus rubra" and "Alnus rhombifolia") and arroyo and yellow willow ("Salix lasiolepis" and "S. lasiandra") are dominant in these types of woodland, with bigleaf maple ("Acer macrophyllum"), box-elder ("Acer negundo" ssp. "californicum"), and California bay also being common. Wet meadows are present in several high-elevation spots on the mountain, while High Marsh represents a rare example of a marsh community on the mountain.