Michigan Trees: A Handbook of the Native and Most Important Introduced Species
d. Leaves 2-4 inches broad, thin, not pentagonally 5-lobed;
wings of fruit 3/4-1 inch long.
e. Leaves distinctly white-downy beneath; twigs appressed-hairy, at least near the tip; fruit hanging in pendulous racemes, persistent on the tree until autumn; seed portion with pit-like depression on one side; usually a shrub or bushy tree. _A. spicatum_, p. 179.
ee. Leaves not distinctly white-downy beneath; twigs glabrous; fruit hanging in clusters, falling in early summer; seed portion without pit-like depression on one side; medium-sized tree. _A. rubrum_, p. 187.