Another gum tree ID - Brisbane

Eric Frei

Close to the Brisbane river.

I rule out the following ssp:- grandis, saligna, tereticorins

You'll see by the pics that it can have 3 or 4 valves, outward curved. Bark sheds in longs strips. I'm leaning toward E Dunnii

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bill24

Looks like "Eucalyptus globulus (Blue gum)" Eric, what do you think ?

Jeff Darby

Caps are wrong for globulus..

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Eric Frei

I think I'm over these bloody eucs!

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Brent Ferris

Maybe a key needs to be developed for the 50 or 100 most commonly seen eucs -- based on features that working arborists can readily identify, vs variable minutiae that even experts argue about.

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Darrell Mcleod

Hope I do not get into trouble for this

After all this is a tree forum

This is E Dunnii

Me too

Damn hard some of them

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Eric Frei

There's many keys already but there's around 800 ssp and some do hybridise making it harder. Then you have people planting them which mixes up geographics of the tree's natural range.

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jmcg.insight.gardens

pretty damn close to E. dunnii, that is an old cap, Cruisin_along,..... sometimes they can drop the tip to the valves as they desiccate. Quite likely a hybrid with two valve numbers.

Will have a look at Euclid tomorrow, how many metres high is the tree Eric? Also cap measurement is always handy, how many mm by calipher? or at a guess if no specimen on hand.


Yeah, Eucs. are mind twisters alright, but what the heck, practice makes you better if not slighty .

Awesome camera by the way Eric.

Darrell Mcleod

Pic came from Euclid

jmcg.insight.gardens

L.O.L

Still think it's close from the caps.

Well its hit the books then.

Darrell Mcleod

What are the best Euc ID books?

Eric Frei

I use and like Forest Trees of Australia 5th Edition because it covers more than eucs that are naturally occuring by geographics. Only down side is B&W pics but if you see eucs in certain places this will home in on that. I have some other books but I use this one the most.

It's $110

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redmower

Can you tease a seed out of the gum-nuts? dry them and maybe they will release for you. Can you show and fresh buds of the bud caps -operculum

granulated patchy bark = grey gum, flattened disk on the fruits narrows down which grey gums to pursue further

Is there a reason why E. punctata wasn't considered?

RM

Eric Frei

Pics of the cap of punctata. Source:


Eucalyptus canaliculata, punctata and propinqua fruit

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redmower

Begging your pardon Eric in photo of the previous post, aren't they the fruits.

The cap (operculum) being the yellow? witches hat type cover that popped off when the flower opened . They will often remain on the ground for several weeks. Some of the fruit look green, maybe caps could still be present under the tree.





My suggestion to consider E. punctata should be read as E. longirostrata. Shows I am still living in the 1980's when is was named E. punctata var longirostrata. But maybe this is out of range anyway.

Eric Frei

Maybe, maybe not.

In reality I wasn't really on that job to assess or report on the trees but the damage they were causing to the retaining wall of a neighbouring property.

There was a row of eucs, and I picked up a few caps but straight off the bat the trees were not what I'd easily bet on as a species if you know what I mean.

In my report I wrote that I wasn't assessing the trees but noted some concerns however did find them responsible for damage to the small retaining wall.

So, I really do not want to revisit.

Also the trees are BCC's trees, so they can figure it out.

But it does get frustrating not to confidently know just like that.

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jmcg.insight.gardens

Hi Redmower,

when discussing caps on this forum we are discussing the capsule of Eucalyptus species, we are just shortening it to cap for ease of typing, but I will note that I should type cap. with a full stop to shorten the name.

The operculum is not a "cap", it is the operculum. The fruit of Eucalyptus species are capsules.

I disagree with E. punctata, it does not have the distinctive band at the rim of the capsule, which I have been taught is one of their key identifying features, it seems from my quick look at E. longirostrata that this species has this band as well.

Eric, I do not know one expert that knows every species of Eucalyptus on sight, too many species. Too hard a field. So I wouldn't worry about it.

redmower

Hi JCMG

By my comments I am hoping to influence a trend towards standardised terms in tree id, eucalypts are a good example. fruit is better than cap. operculum is better than cap (as I was once trained to use)

Eric's pictures of the grey gum are an excellent example of the range info to help identify many eucalypts. Bark detail, shape and form of the tree, leaves and fruit with measure for scale, description of site + locally natural vs planted specimen. In a forest setting I was stationed a while back the operculum was the clue to splitting two red gums apart and two grey gums could also be separated by the differing opercula in the absence of fruit.

I have learnt of differences between Cook pine and Norfolk pine from this site. Another was the comparison between picabeen and bangalow palms. These posts are interesting, sometimes puzzling and ever informative at times.

It's the quality in the detail that becomes important when things look or sound similar. (and yes I realise I am talking to the converted so please don't take this as smart alec comments).

jmcg.insight.gardens

I agree Redmower that standised terms are a good thing and I was very careful to use the correct botanical terms when first coming on the site, I think I'll pick it up again, it is important. I also like to reference the botanical name correctly, but I usually get on the forum once everything is done for the day, so that is usually late at night, so I've become a bit negligent in that department as well.

I can't agree with changing capsule for fruit though, as the correct botanical term is capsule.

I don't mind the fact you query or point out things, it's part of the forum, and a good thing.

All the best.

Julie