The two seeds are initially fused but break apart when mature. The fruits of maples are the well-known maple keys (samaras) consisting of a basal seed with an elongated, flat, rather papery wing. Some maple species may be either monoecious or dioecious. Some maple species are monoecious (have separate male and female flowers on the same tree), while others are dioecious (have separate male-flowering trees and female-flowering trees). They are radially symmetrical, usually with 4 or 5 sepals, which may be fused and are often colored 4 or 5 free petals (or no petals) 3–8 strongly protruding stamens and 1 pistil attached to 2 fused structures that will become the distinctive, paired maple “keys” (samaras). The leaf blades are usually simple and palmately lobed (often shaped something like a star or an outstretched hand), although one of our maple species (box elder) is pinnately compound, with 3 or 5 separate leaflets. The leaves of maples are opposite and have definite leaf stems (petioles). Maples have distinctive leaves, flowers, and winged fruits (samaras). What distinguishes maples, as a group, from other woody plants? Depending on the species, maples may be shrubs or trees Missouri’s native species are usually trees. They also provide stunning fall color, commercially important lumber, sap for syrup, and welcome shade on a hot summer day. Maples are important members of native ecosystems. Missouri has five species of maples that are either native or naturalized, plus several that are known only in cultivation.
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