Acer velutinum UWBG Washington Park Arboretum, Seattle; accession 1982. Native to the Caucasus and northern Iran; propagated readily from seed, but is rare in horticulture. Leaves: 5-lobed, 15-25 cm across, glaucous beneath or with a yellow-brown tomentum along the nerves, bases almost cordate, lobes ovate; margins coarsely serrate to lobulate; petioles 10-25 cm long. Acer velutinum, the velvet maple, is one of the largest maples; very few species grow faster or taller. It grows to a huge tree of 25 m tall with large leaves, surpassed in size only by Acer macrophyllum. Van Gelderen, et al. Maples of the World (Timber Press 1994).