differences between chinese irises

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Hi all,
 
It's a long time I have problems to understand the differences between some chinese irises.
I grow from many years Iris japonica and Iris wattii, and the last year I have had 3 new species of the same group:
I. formosana, I. sichuanensis, I. confusa.
 
I'm rather sure I. confusa and I. sichuanensis I got are two different species or forms because they are not similar to japonica and wattii. But I'm waiting for their first blooming to recognize some new features which can clarify the situation.
 
Can somebody tell me the main features of the known species of this group?
Is I. sichuanensis a valid species?
Which species of this group can produce tall bamboo-like stalk?
 
Thank you
fil.

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