On the bases of several structural features, we can divide angiosperms into tow groups, called monocots and dicots. The names monocot and dicot refer to the first leaves that appear on the plant embryo. These embryonic leaves are called seed leaves or cotelydons. A monocot embryo has one seed leaf; a dicot embryo has two seed leaves. Most monocots have leaves with parallel veins. Dicots have a multibranched network of veins. In the image below there is a monocot with parallel veins in its leaves.