Eucalyptus globulus subsp. bicostata

Southern Blue Gum, Eurabbie at Greenway, ACT

Eucalyptus globulus subsp. bicostata at Greenway, ACT - 20 Aug 2018
Eucalyptus globulus subsp. bicostata at Greenway, ACT - 20 Aug 2018
Eucalyptus globulus subsp. bicostata at Greenway, ACT - 20 Aug 2018
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Identification history

Eucalyptus globulus subsp. bicostata 31 Aug 2018 MichaelMulvaney
Eucalyptus globulus subsp. bicostata 27 Aug 2018 michaelb
Eucalyptus saligna 26 Aug 2018 michaelb
Unidentified 26 Aug 2018 michaelb

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User's notes

Apparently planted and multiplying; also been cut down by rangers and regrown; on the east side of the Murrumbidgee River, north of Pine Island.

13 comments

michaelb wrote:
   26 Aug 2018
If my memory is correct Rainer R told me that these were Sydney Blue Gums. The name which ANBG gives is Eucalyptus saligna, and it would be a new one for our species list.
Mike wrote:
   27 Aug 2018
Maybe another Blue Gum Eucalyptus globulus subsp. bicostata. This is being removed from some areas as it is a fire hazard and an invasive non-local species.
natureguy wrote:
   27 Aug 2018
Eucalyptus globulus is the Tasmanian Blue Gum not the Sydney Blue Gum.
Mike wrote:
   27 Aug 2018
That's why I said 'maybe another Blue Gum'. We will have to wait for Rainer to say whether MIchaelb's recollection is correct. I think there's more than one Sydney Blue Gum too.
natureguy wrote:
   27 Aug 2018
I just checked and Eucalyptus saligna appears to be the only Sydney Blue Gum.
Mike wrote:
   27 Aug 2018
I am no expert so I got my info from Wikipedia - - 'sometimes regarded as blue gums … Sydney blue gum (Eucalyptus notabilis)', though the entry for that doesn't mention blue gum.
I think the third photo of this sighting shows juvenile foliage like E. globulus. 'opposite pairs on square stems' but I will wait for the experts.
michaelb wrote:
   28 Aug 2018
Maybe I was told Blue Gum. Mike's suggestion seems more accurate. So I've changed my suggestion to Eucalyptus globulus subsp. bicostata.
   31 Aug 2018
Eucalyptus globules subsp bicostata is a mainland (largely Victorian species) that grows on the great Dividing Range up to north of Armidale. It is called Sydney Blue Gum by old Nurseyman like Rainer and is one of the most common eucalyptus plantings in the Canberra region.
rainer wrote:
   31 Aug 2018
There are at least three “types” of blue gums that have been planted in our region. According to PlantNet, one, formerly known as E. globulus is now E. pseudoglobulus (http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Eucalyptus~pseudoglobulus), in our region apparently only natural in the South Coast Botanical Region, and E. bicostata (http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Eucalyptus~bicostata) from the South-western Slopes region, where it meets the Southern Tablelands. The link to AVH on both species’ pages in PlantNet takes you to the same page, to a taxon called E. globulus subsp. pseudoglobulus. Another formerly recognised species was E. st johnii. This taxon, from Victoria, is now also apparently regarded as a subspecies of E. globulus. So, what were perhaps three taxa are really only one, E. globulus subsp. pseudoglobulus. Sydney Blue Gum, E. saligna, is quite different. It also occurs in the coastal ranges east of Canberra. The Tasmanian Blue Gum is E. globulus subsp. globulus. Here’s a factsheet on the weediness of that taxon, and I’d say it would probably refer to all globulus subspecies. https://keyserver.lucidcentral.org/weeds/data/media/Html/eucalyptus_globulus_subsp._globulus.htm
michaelb wrote:
   31 Aug 2018
Thanks Michael M. I'm glad my memory is still functioning !
BettyDonWood wrote:
   31 Aug 2018
Plantnet is out of step with the approved names. The approved names are subspecies of Eucalyptus globulus - Eucalytus globulus subsp. bicostata (Eucalyptis bicostata and Eucalyptus St Johnii) and Eucalyptus globulus subsp. pseudoglobulus (Eucalyptus pseudoglobulus).
Euclid4 fact sheets: bicostata - http://keyserver.lucidcentral.org:8080/euclid/data/02050e02-0108-490e-8900-0e0601070d00/media/Html/Eucalyptus_globulus_subsp._bicostata.htm
pseudoglobulus - http://keyserver.lucidcentral.org:8080/euclid/data/02050e02-0108-490e-8900-0e0601070d00/media/Html/Eucalyptus_globulus_subsp._pseudoglobulus.htm
Subsp. globulus - http://keyserver.lucidcentral.org:8080/euclid/data/02050e02-0108-490e-8900-0e0601070d00/media/Html/Eucalyptus_globulus_subsp._globulus.htm
rainer wrote:
   31 Aug 2018
Not sure how up-to-date AVH is in comparison to the Euclid key. See my note about AVH.
rainer wrote:
   31 Aug 2018
By the way, I didn’t mention Sydney Blue Gum in relation to this sighting. I merely said it was one of the blue gums, but recognise Sydney Blue Gum as being quite different!

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  • 4 - 15 Abundance
  • 20 Aug 2018 05:22 PM Recorded on
  • michaelb Recorded by

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  • Greater than 5 metres Plant height

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