Alnus rubra
Riparian woodlands and shrublands are a mosaic of tree-dominated plant communities and open shrublands found along rivers. Species composition varies with elevation, slope, floodplain width, and flooding history. Nevertheless, common trees include white alder ("Alnus rhombifolia"), red alder ("Alnus rubra"), box elder ("Acer negundo"), Fremont cottonwood ("Populus fremontii"), red willow ("Salix laevigata"), coast Douglas-fir ("Pseudotsuga menziesii var. menziesii"), California sycamore ("Platanus racemosa"), coast live oak ("Quercus agrifolia"), and bigleaf maple ("Acer macrophyllum"). Common shrubs include sandbar willow ("Salix exigua") and arroyo willow ("Salix lasiolepis").