White Alder (Alnus Rhombifolia) is a tree in the Birch Family (Betulaceae). It’s native to western North America, blooms Mar-May and grows 50-80 ft. It’s commonly found near streams and wetlands; likes wet to dry soils and partial to full sun exposure.
White Alder is less common than Red Alder; like all Alders is known to fix nitrogen, making it easier for smaller shrubs and forbs to live underneath. It does not form clusters because seedlings have a hard time germinating. It can be naturally found in small groups and it’s planted in stream and wetland restoration sites.