A. 'Keithsform' Yellow-orange to red autumn foliage. Int. 1989 by the Schmidt Nsy of Boring, Oregon. Syn. NORWEGIAN SUNSET.

A. 'Warrenred' Smaller than A. platanoides and with smaller leaves, more cordate at the base and acute wing angle on the fruit. Earlier than 'Keithsform',with yelloworange to bright red autumn foliage. Syn. PACIFIC SUNSET.

Source: Spencer, R. (2002). Aceraceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 3. Flowering plants. Dicotyledons. Part 2. The identification of garden and cultivated plants. University of New South Wales Press.