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WendyEM
wrote:
Yesterday
It is a bit tricky having some Exocarpos sp in 'trees' and others in 'shrubs'
Exocarpos cupressiformis
abread111
wrote:
6 Sep 2025
@Mike
The key for Pyrus at https://keybase.rbg.vic.gov.au/keys/show/7463 has P. calleryana and P. ussuriensis distinguished by whether or not the calyx is persistent in the ripe fruit - persistent in P. ussuriensis. Not very helpful at this time of year. Also for P. ussuriensis says "Leaf serrations distinctly bristled at the tip"
The earliest of several cultivars of P. calleryana at North Watson is flowering now.
The key for Pyrus at https://keybase.rbg.vic.gov.au/keys/show/7463 has P. calleryana and P. ussuriensis distinguished by whether or not the calyx is persistent in the ripe fruit - persistent in P. ussuriensis. Not very helpful at this time of year. Also for P. ussuriensis says "Leaf serrations distinctly bristled at the tip"
The earliest of several cultivars of P. calleryana at North Watson is flowering now.
Pyrus calleryana
Mike
wrote:
6 Sep 2025
Pyrus calleryana has a reputation of bad-smelling blossoms. Related Pyrus ussuriensis also smells bad, but there is less comment on this. As Pyrus ussuriensis street trees are now in bloom I went to the Arboretum where I knew there was Pyrus calleryana, but it is not yet in flower so I couldn't make a comparison. There is possibly a month difference in flowering times of different cultivars. I suspect both species are invading our nature reserves, but I am unsure how to tell the difference.
Pyrus calleryana
Mike
wrote:
6 Sep 2025
Sorry @Csteele4, I hadn't had time to provide information. This is an update to Pyrus calleryana (Callery Pear) which I made in response to increasing concern about Pyrus calleryana becoming invasive. In other comments about this species you can see it has been banned in some places overseas, and now it is getting government attention.
The trees planted at the National Arboretum are in bud and haven't blossomed yet this year. Photos 3 and 4 show the vigorous spiny growth from remnant roots once the trees are damaged.
@waltraud, @abread111, @Katy.
The trees planted at the National Arboretum are in bud and haven't blossomed yet this year. Photos 3 and 4 show the vigorous spiny growth from remnant roots once the trees are damaged.
@waltraud, @abread111, @Katy.
Pyrus calleryana
Csteele4
wrote:
6 Sep 2025
This is an odd one. Identifying an identified tree in the arboretum? Do you have doubts? I'm a bit confused...
Pyrus calleryana
Significant sightings
- Ailanthus altissima at Marulan, NSW
- Daphnandra apatela at Martinsville, NSW
- Solanum chrysotrichum at Gleniffer, NSW
- Anetholea anisata at Bindarri National Park
- Dendrocnide excelsa at Bungonia, NSW
- Daphnandra johnsonii at Jamberoo, NSW
- Pyrus calleryana at O'Malley, ACT
- Schinus molle at Campbell, ACT
- Allocasuarina luehmannii at Environa, NSW
- Pittosporum undulatum at Isaacs, ACT
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