HYB: tetraploids & colchicine

I'm going to tackle several topics in one message.  I hope it's not too long.

First of all, most catalogs I have don't specify which cultivars are
tetraploids (be it TB's, AB's, LA's, etc.).  How can I find out what
tets are available?  I would like to acquire some tets for hybridizing.

Secondly, I have a number of varieties (color variations) of iris versicolor
(versicolor is one of the 5 species which contribute genetic material to the
Louisanas).  Besides colchicine treatments (which I don't know how to do)
is there any way to get these dips to become tets?

I. verna is the sole member of its series, as is i. prismatica the sole
member of its series (or at least so I have read).  Are there any known
attempts at crossing these with other series such as Louisianas?  Could it
work?  Would the chances be better if they were raised from dip to tet
levels?

Dennis Kramb; dkramb@tso.cin.ix.net
Cincinnati, Ohio USA; USDA Zone 6; AIS Region 6
Member of AIS, ASI, HIPS, RIS, SIGNA, & Miami Valley Iris Society
Primary Interests: Hybridizing Arilbreds, Raising Native Ohio Species Irises
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