I doubt that many gardener's will just settled for just green.
I'm pretty sure there is no such thing: Green.
From a gardener's point of view that is:
He (or more likely she) will see colours like:
Apple, Lime, Asparagus, Ferns, Honey Dew, Mint, Olive, Pear, Jade...
And a host of others which clearly blurs the definition in perfect context.
Mine However...
You can invent to call whatever means necessary to identify them...
There is such joy however to identify them by their species names..
And variegated plants are just like a pinch of salt..
Adding taste to the existing colours and shades of green.
Don't you agree?