Aceraceae | box elder
Habitat: Riverbanks on rich soil.
Leaves: Pinnate, with three to five or seven toothed, sometimes lobed leaflets, each borne on a slender rachis and ending in a long tapered point, the terminal leaflet to 4" long and 2 1/2" across, dark green and smooth above, smooth or downy beneath.
Bark: Gray-brown and smooth.
Flowers: Males and females both small, yellow-green, or pink in some forms, without petals, the females soon showing small, developing fruit wings, in hanging, tassel-like clusters, on separate platns in spring before or with the leaves.
Fruit: With down-pointing curved wings, to 1 1/2" long, persisting on the plant during winter.
Coombes, A. J. (1992). Trees. New York: Dorling Kindersley.