<<Disclaimer: Verify this information before applying it to your situation.>>

I remember finding this interesting when I was first starting my diet.

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TAXONOMIC RELATIONSHIP OF MAJOR CEREAL GRAINS

FAMILY                                             Gramineae
                                                  /         \
                                                 /           \
                                                /             \
                                               /               \
                                              /                 \
                                             /                   \
SUBFAMILY                             Festucoideae            Panicoideae
                                     /        |  \                |
                                    /         |   \               |
                                   /          |    \              |
                                  /           |     \             |
                                 /            |      \            |
                                /             |       \           |
                               /              |        \          |
                              /               |         \         |
TRIBE                  Triticeae           Aveneae   Oryzeae  Tripsaceae
                      /        \              |         |         |
                     /          \             |         |         |
                    /            \            |         |         |
SUBTRIBE      Triticineae         \           |         |         |
              /         \          \          |         |         |
GENUS     Triticum    Secale     Hordeum    Avena     Oryza      Zea
              |          |          |         |         |         |
SPECIES  T.aestivum  S.cereale  H.vulgare  A.sativa  O.sativa   Z.mays
           (WHEAT)     (RYE)     (BARLEY)   (OAT)     (RICE)    (CORN)