Re: SPEC-setosa/hookeri


> Nr: Bill Shear <bills@tiger.hsc.edu>
> Jnls: Multiple recipients of list <iris-l@rt66.com>
> Rel`: Re: SPEC-setosa/hookeri
> D`r`: 18 dec 1997 c. 17:29
> 
> Yes, but you have to consider also the Asian populations of setosa.  If
the
> setosa complex originated in Asia and migrated to North America, then it
> seems likely that the original species was indeed very close to what we
> call setosa today, or that the Asian setosa and North American setosa
> evolved entirely in parallel from the hypothetical parental species.  The
> latter hypothesis is more ad hoc and thus less likely to be true.
> 
> It's also possible (and perhaps marginally more likely) that the Asian
> populations of setosa represent a colonisation event that took place
AFTER
> the hypothetical ancestor had split into setosa and hookeri.  If that is
> true, then both setosa and hookeri are much older than the last glacial
> maximum, having speciated during some earlier GM.

Do you remember there are two subspecies of setosa as minimum. First, Iris
setosa grow in interior and maritime parts of Asia and only maritime parts
of Northern America. Second, Iris setosa subsp. interior grow in interior
parts of Asia and America. It occupy more large area in Asia than first but
is very rare there.
Probably there was two opposite directions of migration iris setosa in
different eras? One could be nautical! Setosa can grow at salty soils near
edge of sea water and its seeds don't sink up to 200 days!

Juri Pirogov,
Moscow, Russia



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