Re: transitive properties of hybridizing

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I don't think chromosome counts are that important; better to simply know what's considered related to what. Most of the beardless crosses are being done between the series Laevigatae, Sibericae, Chrysographes/Californicae and Tripetalae, which form a clade in the genetic work that's been done. Probably any of them can be crossed if you try long enough.

I assume ensata should be able to be crossed with siberians. I. tridentata is closely related to setosa, which has been crossed with versicolor. Tamberg produced versitosas with tetraploid setosa, but I assume the diploid cross is possible, just harder to make - it's basically like a ×robusta. I can't see why tridentata wouldn't work as well.

Sean Z