Botanical english beats me

["Greger Lindstrand" <greglind at algonet_se>]

Sometimes, it is hard to understand english and especially botanical terms.

Could I have some examples of aquatic plants that is:
Monocot ?
Dicot ?
Gymnosperm ?
What does those words mean?

What does "gummy exudate" mean?
and
"Plant is a noncotyledonous" ?

These words/terms I have come across on the net (and many more). I write them down and try to find translations when I can. The above examples is the ones I definitely havn't been able to solve.
I'd much appreciate an explanation of them.

Best regards
Greger Lindstrand