|A. buergerinum is a rare maple in North America and Europe. One of the most difficult to propagate, its a spreading, deciduous tree with 3 1/2-inch dark green leaves above and blue-green on the undersides. Blooms in yellow flowers. The cultivar, 'Koshi miyasama' is a densely branched, strong shrub or small tree with leathery leaves. It has rounded leaf bases and short and blunt lobes.