Acer negundo ssp. californicum UWBG Washington Park Arboretum, Seattle; accession 1958. Found in valleys and riverbanks in central and southern California; also in Arizona in moist situations. The very conspicuous hairiness distinguishes subspecies californicum at a glance from its allies [interius; mexicanum; negundo]. Van Gelderen, et al., Maples of the World (Timber Press 1994).