Myriophyllum sp.

Water-milfoil at Rendezvous Creek, ACT

Myriophyllum sp. at Rendezvous Creek, ACT - 11 Nov 2024
Myriophyllum sp. at Rendezvous Creek, ACT - 11 Nov 2024
Myriophyllum sp. at Rendezvous Creek, ACT - 11 Nov 2024
Myriophyllum sp. at Rendezvous Creek, ACT - 11 Nov 2024
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Identification history

Myriophyllum alpinum 11 Nov 2024 WalkYonder
Myriophyllum alpinum 11 Nov 2024 WalkYonder
Myriophyllum sp. 11 Nov 2024 JaneR
Myriophyllum crispatum 11 Nov 2024 WalkYonder

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3 comments

JaneR wrote:
   11 Nov 2024
probably Myriophyllum variifolium. Would need leaf details and/or flowers to confirm.
WalkYonder wrote:
   11 Nov 2024
Different leaves to Myriophyllum variifolium
I have changed my mind on closer inspection and believe it is Myriophyllum alpinum based on leaves
JaneR wrote:
   11 Nov 2024
To me, the leaves look like 'transitional' leaves, ie the leaves that milfoils have, that grow in-between emergent (aerial) and submerged leaves, and can be rather different from emergent and submerged leaves. In the off-growing season, and in plants stranded by receding water levels, these are sometimes the only leaves. Generally transitional leaves aren't used for diagnosis.

I think it is likely Myriophyllum variifolium partly because I suspect the leaves are transitional, but also because this site is relatively low - its not an alpine or subalpine location (although it is a cold valley) - and possibly more than 3 leaves per whorl.
Flowering material would confirm either way; but that means waiting for summer or growing out some material.
If it is M. alpinum then that would indeed be a good find, and a downward altitudinal extension relative to its other records.

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Location information

Sighting information

Additional information

  • 10cm to 30cm Plant height

Species information

  • Myriophyllum sp. Scientific name
  • Water-milfoil Common name
  • Not Sensitive
  • Local native
  • Non-invasive or negligible
  • Up to 1633.08m Recorded at altitude
  • Machine learning
  • In flower

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  • Nearby sighting(s) of same species
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  • Description
  • Additional attributes
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