Monocots and dicots
The structures of dicot and monocot seeds are shown. Dicots (left) have two cotyledons. Monocots, such as corn (right), have one cotyledon, called the scutellum, which channels nutrition to the growing embryo. Both monocot and dicot embryos have a plumule that forms the leaves, a hypocotyl that forms the stem, and a radicle that forms the root. The embryonic axis comprises everything between the plumule and the radicle, not including the cotyledon(s).
Source
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"OpenStax College, Pollination and Fertilization. October 17, 2013."
http://cnx.org/content/m44723/latest/Figure_32_02_09.png
OpenStax CNX
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