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Re: Genus & Species

another thing...Sometimes you'll see xHeucherella and sometimes just
Heucherella.  This is an intergeneric cross for which they crossed a
Heuchera with a Tiarella, creating a xHeucherella.  The x belongs in front
of the the new genus name (sometimes with a space as in "x H.") to indicate
it is an intergeneric hybrid.  However they've been making Heucherellas for
quite a while now, so they usually drop the x (screws up their

I'm sure you are familiar with addtional taxonomies like variety (var.),
forma, (f.), and subspecies (ssp. or subsp.) but I recently came across a
listing that was new to me. It is called a graft chimera and is designated
with a plus sign in front of the genus name, as in :  +Laburnocytisus
adamii.  A Parisian, J.L. Adam grafted Chamaecytisus purpureus (Purple
Broom) onto Laburnum anagyroides (Golden Rain Tree).  He expected the
flowers to be the pinkish purple of the Purple Broom, but they were bicolor,
both yellow and purple, a result of contributing factors from both the
rootstock and the scion.  Over time these trees had not only the "hybrid"
flowers but also flowers of both the rootstock and  scion began to appear
along the tree's branches.

The tree is an ammalgamation of both parents' genetic material, but without
actual fushion of the cells.  This is known as a graft chimera, defined as a
grafted plant that exhibits a rare phenomenon wherein the cells of the
rootstock extend upward and into the scion while retaining their genetic

neIN, Z5
----- Original Message ----- 
From: "A A HODGES" <hodgesaa@earthlink.net>
To: "gardenchat" <gardenchat@hort.net>
Sent: Thursday, March 10, 2005 9:00 PM
Subject: [CHAT] Genus & Species

> I have a question. After all these years of gardening, studying, etc, I
> was looking at the Wayside Gardens catalog for about the hundredth time
> tonight. MANY of their plants are labeled with only the genus and then
> the cultivar or hybrid name. From my early horticulture classes, if I
> recall, most all plant are either genus and species, genus, species, and
> cultivar, or genus X (meaning a cross, or hybrid, and the name).
> SO, my question is, how can you tell what the species of these plants
> are or what the crosses of hybrids are? I'm specifically referring to
> Magnolias, although many of their plants were listed like this.
> They have Magnolia 'Coral Lake', Magnolia 'Sunrise', Magnolia
> 'Sunspire', (which I bought) but no indication of what "kind" they are.
> Mine is deciduous, and most of these I'm sure are some cross of Magnolia
> soulangeana. And, Coral Lake even has the hybridizer's name in the
> description, but no reference to him in the plant name.
> What am I missing? Why is there on the Genus, and the cultivar name? I
feel sure I should know the answer to this, but I don't.
> Andrea H
> ---------------------------------------------------------------------
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