Acer kenaicum (Acer kenaicum)
Description
Acer kenaicum is an extinct maple species in the family Sapindaceae described from a pair of fossil leaves and a samara. The species is solely known from the Oligocene sediments exposed in central coastal Alaska, US. It is one of several extinct species belonging to the living section Rubra. Leaves of Acer kenaicum are simple in structure, with perfectly actinodromus vein structure and are widely ovate in shape. The leaves are five-lobed with upper lateral lobes that are two thirds as long as the median lobe. All the lateral lobes are triangular in outline while the medial lobe is elliptic in outline. The leaves have five primary veins, five secondary veins that diverge from the lateral primary veins and six medial secondary vein pairs.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum:
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Class: Magnoliopsida
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Order: Sapindales
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Family: Sapindaceae
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Genus: Acer
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