So, here is "My" groupings. (It is easy to suggest a need for a change and then not put one forth. This is a hazard though, as I run the risk of being shouted down (well, not here; I mean in general at AIS events/functions).
I would break it down like this.
1. Irises collected/found (1500-1840)
2. Irises hybridized 1840 to WW2
3. Post WW2 (1946-1958)
4. New Age I (1959-1974)
5. New Age II (1975-1990)
6. Space Age (1991-2002)
7. Current (2003- )
The names and the time frames of the categories is all subjective. They can slide a bit. To me, this is much better way to differentiate cultivars than with just two categories (Historic and Current). Styles, flower form, plant form, ect all are factors to making a new comprehensive list.
Does it matter what names you give the categories? Probably. Everything is changable.
Ancient
Centurian
Historic
Classic
Neo-Classic
Just my 2 cents worth.
