This is the reference document that will tell you the proper classes in which to enter your plants, art work, exhibits, etc.   For the more common genera this should be the only reference document you'll need to register your plants. But if you are registering unusual or unfamiliar plants whose alliances you don't know, you will have to look them up to determine what classes they belong to.  See MAOC Class Codes next.

MAOC Class Codes by Genus
pdf file

Note -  some genera are assigned to more than one class code based on flower color or hybridization.  When multiple class codes are indicated, go back to the IOS Entry Schedule above to pick the appropriate one.

Intergeneric Hybrid Makeup
pdf file

Consult this list if you are registering an obscure intergeneric hybrid and are curious as to the genera in its composition.  Just because it's fun to know these things.

Aside:  If you consider this material to be an exercise in instruction creep, please feel free to suggest simplifications. :))