Potamogeton sp (cheesemanii or sulcatus)

Pondweed at Majura, ACT

Potamogeton sp (cheesemanii or sulcatus) at Majura, ACT - 16 Jan 2021
Potamogeton sp (cheesemanii or sulcatus) at Majura, ACT - 16 Jan 2021
Potamogeton sp (cheesemanii or sulcatus) at Majura, ACT - 16 Jan 2021
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Identification history

Potamogeton sp (cheesemanii or sulcatus) 18 Jan 2021 michaelb
Potamogeton sp (cheesemanii or sulcatus) 18 Jan 2021 michaelb
Potamogeton sulcatus 17 Jan 2021 michaelb
Unidentified 16 Jan 2021 JaneR

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User's notes

Plants mostly stranded on wet muds by falling water levels: occurring infrequently in this dam, only on southern shore.

13 comments

JaneR wrote:
   17 Jan 2021
I assigned it to Potamogeton cheesemanni rather than P. sulcatus due to number of longitudinal veins being two few for P. sulcatus, and number of flowers in spike being too few also. But leaf width length was indeed more like P sulcatus
michaelb wrote:
   17 Jan 2021
Do you think this sighting ID is correct for Potamogeton cheesemanni ?:- Potamogeton cheesemanii (Pondweed)
It is different from this one:- Potamogeton cheesemanii (Pondweed)
JaneR wrote:
   17 Jan 2021
Hi Michael,

How do you decide what characteristics to rely on ?
I can see that the wider more lime-green leafed plants look different from the narrower, darker plants; but wonder if that is phenological differences: early season v later older plants.

I have just checked a specimen collected from the same dam on 9 Dec 2020. Overlapping characteristics are leaf size (3.7x2.6, 5.8x3.4 - either species); rounded apex; number of flowers is 20, or 21. Characteristics that fit P. cheesemanii are: longitudinal veins are 15, and infructescence is 1.8 cm long.
Sighting 4198017 also looked like it should be P.sulcatus but had metrics that better suited P. cheesemanii.
Sighting 4352668 was earlier in the season; but has only 9-11 longitudinal veins (no specimen collected so have no other info).
I don't know how to resolve this - ??
michaelb wrote:
   18 Jan 2021
My botanical skills are limited, so I can't resolve it. We need trained botanist. The problem of differentiating the two species will continue, so I have added a new name to the species list "Potamogeton sp (cheesemanii or sulcatus)". If we can't solve the problem we can classify it that way:- https://canberra.naturemapr.org/species/46052
JaneR wrote:
   18 Jan 2021
that is an excellent solution, responsible and practical. if resolution requires detailed examination, then ID down to species will otherwise always be a stumbling block for CNM.
michaelb wrote:
   18 Jan 2021
Thanks Jane
JaneR wrote:
   18 Jan 2021
Should this be applied retrospectively to other Potamogeton contentious ID ?
michaelb wrote:
   18 Jan 2021
I've re-ID Potamogeton sp. & moved a few into the new grouping, only 2 left:- https://canberra.naturemapr.org/species/22322
Tapirlord wrote:
   14 Feb 2023
My understanding is that p.sulcatus has broader leaves ovate-elliptic as opposed to p.cheesemanii which will have lanceolate-ovate (never elliptic). p.sulcatus has longer infloresence with crowded flowers (usually greater than 20), while p.cheesemanii has short infloresence (under 3cm) & less crowded infloresence. as jane says p.sulcatus is said to have more than 20 veins per leaf but this can be difficult to determine from photos. i would say considering everything this is most likely p.sulcatus while the sighting you reference michael (Potamogeton cheesemanii (Pondweed)) is certianly p.cheesemanii.
Tapirlord wrote:
   14 Feb 2023
Also I seem to be having issue with CNM comments (I can't have capitals & hyperlinks in the same comment).
JaneR wrote:
   14 Feb 2023
the counts of veins and flowers on inflorescence were made on actual plant material at the time. These are (for me) stronger characteristics than leaf shape, and so lead me to P cheesemanii: which was a puzzle as leaf shape did look like P. sulcatus.
michaelb wrote:
   15 Feb 2023
Hi Ciaran, I agree there is a bug whereby capitals are lost with hyperlinks.
AaronClausen wrote:
   15 Feb 2023
Thanks @Tapirlord @michaelb we'll sort this shortly.

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Nearby sightings

Page 1 of 3 - image sightings only

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Anas superciliosa (Pacific Black Duck) at Majura, ACT - 12 Jul 2021 by trevsci
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Ancita marginicollis (A longhorn beetle) at Majura, ACT - 26 Feb 2021 by jb2602
Amphirhoe decora (Decora Longicorn Beetle) at Majura, ACT - 26 Feb 2021 by jbromilow50
Rhinotia sparsa (A belid weevil) at Majura, ACT - 26 Feb 2021 by jbromilow50
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Anax papuensis (Australian Emperor) at Majura, ACT - 8 Feb 2021 by trevsci
Chelodina longicollis (Eastern Long-necked Turtle) at Majura, ACT - 8 Feb 2021 by trevsci
Orthetrum caledonicum (Blue Skimmer) at Majura, ACT - 2 Feb 2021 by jbromilow50
Amata (genus) (Handmaiden Moth) at Majura, ACT - 26 Jan 2021 by jbromilow50
Myiagra rubecula (Leaden Flycatcher) at Majura, ACT - 22 Jan 2021 by trevsci
Todiramphus sanctus (Sacred Kingfisher) at Majura, ACT - 22 Jan 2021 by trevsci
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Limosella australis (Austral Mudwort) at Majura, ACT - 16 Jan 2021 by JaneR
Erigeron sp. (Fleabanes) at Majura, ACT - 30 Dec 2020 by Avery
Ottelia ovalifolia subsp. ovalifolia (Swamp Lily) at Majura, ACT - 25 Dec 2020 by SusanneG
Chara sp. (genus) (A charophyte green algae) at Majura, ACT - 9 Dec 2020 by JaneR
Ottelia ovalifolia subsp. ovalifolia (Swamp Lily) at Majura, ACT - 9 Dec 2020 by JaneR
Linaria pelisseriana (Pelisser's Toadflax) at Majura, ACT - 18 Oct 2020 by WalterEgo
Asperula conferta (Common Woodruff) at Majura, ACT - 18 Oct 2020 by WalterEgo
Ottelia ovalifolia subsp. ovalifolia (Swamp Lily) at Majura, ACT - 18 Oct 2020 by WalterEgo
Leptorhynchos squamatus subsp. squamatus (Scaly Buttons) at Majura, ACT - 18 Oct 2020 by WalterEgo

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Location information

Sighting information

  • 16 - 100 Abundance
  • 16 Jan 2021 12:09 PM Recorded on
  • JaneR Recorded by

Additional information

  • True In flower

Species information

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  • Images or audio
  • More than one media file
  • Confirmed by an expert moderator
  • Nearby sighting(s) of same species
  • GPS evidence of location
  • Description
  • Additional attributes
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