Re: Sibtosa

It's my understanding that most of the diploid sibtosas on the market are
from Siberian X I. setosa var. interior. It's also my understanding that no
testing is done so only those diploids that are balanced in appearance have
found their way to market. The more any hybrid looks like a blend of both
species, the more likely it is to be sterile.

Crosses are most easily made when the pod parent has the lower chromosome
count but the reverse is a bit more difficult but not impossible.

I've been working with a few families from crosses using I. setosa
canadensis. The majority of F1s are unbalanced but with enough traits to
suggest a hybrid nature. These plants, while appearing at first glance to be
Siberian, are considerably more dependable in areas where a long, cold
spring would have an adverse affect on bloom of pure Siberians.

Multiple crosses of FOB-setosa resulted in over 57 seedlings, with pods
yielding 1-10 seeds each. Setosa X FOB produced 7 seedlings (1-2 seeds per
pod), only 5 of which were strong enough to live. SKY WINGS X setosa yielded
13 seedlings from pods giving 1-6 seeds each.

A few of my html notebook pages are accessible from
http://www.povn.com/rock/hybrids.html (about 2/3 of the way down the page).
The first link "sibtosas" will take you to images of the balanced hybrids.
Both of these are due to be introduced this season (assuming the gophers
have left them alone.)

F2 seedlings from Setosa X FOB (http://www.povn.com/rock/hSetX02.html) are
showing some very un-setosa ribbing. The first of these may be large enough
to bloom this year. F2s from the Siberian X setosa groups will be germinated
this spring.

Christy

Skip & Christy Hensler
THE ROCK GARDEN
Newport, WA
http://www.povn.com/rock/

----- Original Message -----
From: "tesilvers" <tesilvers@yahoo.com>


> I am interested in the species cross - sibtosas. I'm looking for
> sources and I would also like to generate some sibtosa seedlings. So
> was wondering how easily the 28 chromosome Siberians cross with Iris
> setosa. The few sibtosas I've read about are from siberian seed
> parent and setosa pollen. How numerous and well-formed are the seeds
> from this cross? Also, does the cross work in reverse?
>





 
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