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Embryo with two cotyledons (rarely one by reduction), Vascular bundles of the stem usually arranged in a single ring; cambium usually present, Leaves reticulate veined, Flowers usually 5 to 4 merous - DICOTYLEDONAE
Embryo with one cotyledon, Vascular bundles of the stem usually scattered, cambium usually absent, Leaves usually parallel veined, Flowers usually 3 merous - MONOCOTYLEDONAE