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Myriophyllum crispatum

Water Millfoil at Monash, ACT

Myriophyllum crispatum at Monash, ACT - 4 Mar 2021
Myriophyllum crispatum at Monash, ACT - 4 Mar 2021
Myriophyllum crispatum at Monash, ACT - 4 Mar 2021
Myriophyllum crispatum at Monash, ACT - 4 Mar 2021
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Identification history

Myriophyllum crispatum 9 Aug 2023 JaneR
Myriophyllum papillosum 10 May 2021 JaneR
Myriophyllum papillosum 10 May 2021 MichaelBedingfield
Myriophyllum crispatum 2 May 2021 MichaelBedingfield

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User's notes

At Isabella Pond.

6 comments

JaneR wrote:
   10 May 2021
Hi Michael,
There are two Myriophyllum species in our region that are robust, with erect stems in shallow water. They are very similar !! Defining characteristics are:
Myriophyllum crispatum: crisped hairs on stem, usually;: flowers solitary in axils; female flowers deep red: emergent leaves in whorls of 6-9 and terete.
Myriophyllum papillosum: papillae on stems (usually): flowers in fascicles in axils, female flowers deep reddish purple; emergent leaves in whorls of 4-6, linear sometimes dentate.

The only character clearly visible is that emergent leaves are slightly dentate; possibly they are in whorls of 4-6.
Based on this, then more likely M. papillosum.
Perhaps ther is some drift material on the shore that could give a closer look ?

A bonus is that there seems to be some Marsilea mutica out there as well.

perhaps another opinion ?
   10 May 2021
It is 2 months since my visit & I don't have time to return just now. Note that these were planted in the new landscaped arrangement. Your analysis is much more thorough than mine, so I would be happy to accept your suggestion. Otherwise we could go with Myriophyllum sp.
JaneR wrote:
   10 May 2021
is there a tick box for "plantings" for these plants ?
it is useful to know for people interested in dispersal mechanisms and invasiveness
   11 May 2021
There is no tick box at the moment.
JaneR wrote:
   9 Aug 2023
I think this is more likely to be Myriophyllum crispatum.
Reviewing distribution records shows that Myriophyllum papillosum is not a local species.
   10 Aug 2023
Thanks Jane

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Page 1 of 1 - image sightings only

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