Corymbia citriodora from IARI regional Station Karnal

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Balkar Arya

Jul 18, 2011, 9:05:13 PM7/18/11
to indiantreepix
Dear All

Corymbia citriodora  from IARI regional Station Karnal
very large trees about 50 years old as told by the persons working there leaves scented with lemonoid fragrance

Dr Balkar Singh
Head, Deptt. of Botany and Biotechnology
Arya P G College, Panipat
Corymbia citriodora (1).JPG
Corymbia citriodora (2).JPG
Corymbia citriodora (3).JPG

Satish Phadke

Jul 19, 2011, 2:00:49 AM7/19/11
to Balkar Arya, indiantreepix
Looks like a Eucalyptus species.....


Jul 19, 2011, 7:49:00 AM7/19/11
to efloraofindia
Dear Satish Ji

Here some info......

Long ago in simpler times there was s alarge genus of about 700
species called Eucalyptus and a very small genus (with 7 species)
called Angophora and together they were called gum trees by
Australians because they looked very similar. The reason they were
different is that they differed in two characters- unlike all the
Eucalyptus species (whose flower buds are initially covered by a
little cap), the buds of Angophora are naked and uncapped. That’s
pretty fundamental esp if you remember that the name ‘eu-calyptus’
means ‘well-covered’ pointedly refer to the bud caps. What’s more,
unlike Eucalyptus, the flowers of Angophora have petals, tiny little
ones, but petals nevertheless- and it wasn’t easy to avoid these
This was the situation till 1995, when 2 australian botanists called
Hill and Johnson published a paper formally recognizing a new genus
called Corymbia, comprising 113 species that had been scooped out from
genus Eucalyptus. The genus Eucalyptus had been subdivided into 7to 12
sub-generic groups to manage its sprawling empire of almost 700
species and Corymbia was one of them. Hill and Johnson’s paper argued
that all the species in the sub-group Corymbia differed enough from
the rest of the species in Eucalyptus genus to merit becoming a genus
on their own.
Many scientists resisted the change and continued to use the old name
for Corymbia implicitly disagreeing from Hill and Johnson’s
proposition. At the same time, studies in DNA sequencing were
beginning to show that the Corymbia were in fact more closely related
to Angophora than to Eucalyptus.
Yet resistance to the name change continued. One of the fear was that
by the same logic, taxonomists might seek to promote all the separate
subgenera of Eucalyptus into new genera. What probably rankled most of
all was that – unlike the separation of Eucalyptus from Angophora,
which was based on easily visible differences – the differences
between Eucalyptus and Corymbia are at a subtle level, not easily
recognized. There are no obvious characters of bark bud or foliage to
mark the separation.
Acceptance of the new genus will be a long, slow process but for the
moment, whatever genus one uses – Eucalytus citriodora or Corymbia
cotriodora – the only tree that will be in reference is the lemon
scented gum.



Jul 19, 2011, 8:53:28 AM7/19/11
to efloraofindia
The bark of the tree smells like a lemon, which is an important
indicator for ID of the species, whether it is C.c or E.c. This is
one of the tanniferous trees (bark tannins), grows even in hot places
like Chennai..
>  Corymbia citriodora (1).JPG
> 619KViewDownload
>  Corymbia citriodora (2).JPG
> 521KViewDownload
>  Corymbia citriodora (3).JPG
> 307KViewDownload

Satish Phadke

Jul 19, 2011, 9:41:54 AM7/19/11
to Pinki, efloraofindia
Hi Alok ji
Thanks for that interesting information.
So my guess was correct like any lay man.

Balkar Arya

Jul 19, 2011, 10:08:01 AM7/19/11
to Satish Phadke, Pinki, efloraofindia
Thanks Alok Ji great information
Can u share that paper of Hill and Jonson pls
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