Re: Digest Number 362

Years ago when I would ship TBs, the agricultural inspector would just write
on the phytosanitary certificate, say for 12 TBs, 12 I. germanica. I did not
argue the point since he was okaying it for shipment. I let it go at that.
If he was happy so was I.

Francesca

----- Original Message -----
From: <iris-species@yahoogroups.com>
To: <iris-species@yahoogroups.com>
Sent: Sunday, March 28, 2004 2:09 AM
Subject: [iris-species] Digest Number 362


>
> There is 1 message in this issue.
>
> Topics in this digest:
>
>       1. Re: Re: Eleanor Roosevelt
>            From: "Neil A Mogensen" <neilm@charter.net>
>
>
> ________________________________________________________________________
> ________________________________________________________________________
>
> Message: 1
>    Date: Sat, 27 Mar 2004 09:55:03 -0500
>    From: "Neil A Mogensen" <neilm@charter.net>
> Subject: Re: Re: Eleanor Roosevelt
>
> Dave Ferguson's comments concerning the more-or-less sterile IB's show
generally the same understanding I have had with a single exception.
"Atropurpurea" is listed under the HIPS 'Kochii' entry as a synonym for that
cultivar.
>
> Dave's speculation concerning the origin of 'Eleanor Roosevelt' as being
from the pollen of a (*pumila* x *lutescens*) hybrid is an interesting and
appealing thought.  I'm not aware of any other evidence of any circulation
of authenitc *pumila* clones in the U. S. that early, but the suggestion
makes sense of the chromosome count--if accurate.  Such an origin might
allow at least a little fertility, however, judging by more recent hybrids
of fairly similar nature, many (but not all) of which will produce a few
viable seeds on occasion.
>
> I am under the impression that the *pumila* clones in possession of the
Sass brothers of that generation were all actually *lutescens.*
>
> Counting chromosomes is a very difficult matter with irises.  The slides
are difficult to prepare, the chromosomes are small, and the depth-of-field
of an oil-immersion 300 power lens on even the best of microscopes is so
thin that constant adjustment of the focus up and down through the vertical
diameter of the cell nucleus is required in order to make the counts. So is
the delicate repositioning of the slide required to span the horizontal
diameter.  If the counted nucleus just happens to have one or more of the
shorter chromosomes underneath one of the longer ones a chromosome count can
be short one or two.  Generally an exceptional count becomes more credible
when replicated by more than one sample and one technician.
>
> Both optics and the technology involved have improved somewhat since the
time of the published counts but there is no pressing economic reason to
repeat them with contemporary and advanced equipment.
>
> I am in agreement with Dave that the clones in question are generally of
the 'Germanica' type, although I repeat what I have said before.  To my
understanding the nomen *Iris germanica* actually refers only to the single
clone typed and recorded by Linneus   Numerous other clones of the same
general constitution do exist, but are not ideally referred to as
'Germanica,' even with an "x" inserted into the name.  That usage seems to
be gaining ground and shared understanding and is certainly justified both
by morphology and genetic constitution and also certainly has semanitic
validity even if it lacks taxonomic accuracy.
>
> Neil Mogensen   z  7  western NC
>
> [This message contained attachments]
>
>
>
> ________________________________________________________________________
> ________________________________________________________________________
>
>
>
> ------------------------------------------------------------------------
> Yahoo! Groups Links
>
>
>
>
> ------------------------------------------------------------------------
>
>



 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
     http://groups.yahoo.com/group/iris-species/

<*> To unsubscribe from this group, send an email to:
     iris-species-unsubscribe@yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
     http://docs.yahoo.com/info/terms/
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index