Germinating dicotyledon plants all look very similar to this picture when they first begin to grow. The two seed leaves open and the shoot of the plant's characteristic leaves grows up between them. Dicotyledon leaves are net-veined. Study the pictures of the yellow primroses here to see how their leaves have veins that go down the leaves and also across them. The flowers of dicotyledons have petals and other flower parts arranged in fours and fives, or in multiples of four and five.
Roses have five petals.
Cherry blossoms have five petals. Our fruit trees and deciduous trees are dicotyledons, as are many shrubs and flowers. There are other differences between these two families of angiosperms, but the differences shown here should be enough to help you to identify the groups that plants belong in. Remember that coniferous trees are gymnosperms. Coniferous trees do not belong to the angiosperm family.