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Other Water PlantPotamogeton cheesemanii

Pondweed at Watson, ACT

3 images

Potamogeton cheesemanii at Watson, ACT - 18 Feb 2019
Potamogeton cheesemanii at Watson, ACT - 18 Feb 2019
Potamogeton cheesemanii at Watson, ACT - 18 Feb 2019

Identification history

Other Water Plant Potamogeton cheesemanii 19 Feb 2019 BettyDonWood
Other Water Plant Potamogeton sulcatus 19 Feb 2019 BettyDonWood
Other Water Plant Potamogeton cheesemanii 19 Feb 2019 JaneR

Author's notes

urban wetland, receiving overflow from Billabong Wetland, Watson. Fringed by Bolboschoenus ?medianus. Potamogeton growing with Egeria densa and Vallisneria australis, all in flower: in water about 75 cm deep; heavy epiphytic load.

3 comments

   19 Feb 2019
The leaves appear to be too big for cheesemanii and the number of flowers in the inflorescence too many. The Vicflora key: cheesemanii - floating leaves 0.8-5 cm long, 1-3.5 cm wide, inflorescence usually fewer than 20 flowers; sulcatus - floating leaves 4-8 cm long, 3-5.5 cm wide; inflorescence usually more than 20 flowers. Please comment.
JaneR wrote:
   19 Feb 2019
Yes, I used the Vic key (on-line version updated 2014 which gives slightly different range leaf size for cheesemanii, not as small as 0.8 cm). Specimen taken, currently being pressed.

Floating leaves are 4.6 cm long x 2.9 cm wide, and have 18 veins, excluding central.
Submerged leaves (which are a bit decayed and disintegrated) were up to 10 cm long x 2.5 cm wide, and have 12 veins excluding central (but not very distinct).
Inflorescence appears to have about 24 flowers, and is 2.2 cm long.

Floating leaf size fits either species but vein count matches cheesemannii better. Submerged leaf size fits better with sulcatus, vein count not helpful. Inflorescence number of flowers is just on range for cheesemanii (12-24) but fits sulcatus better (20-60), however overall size fits cheesemanii (1.0-2.5 cm) better than sulcatus (3.2 - 5.0 cm).

There wasn't a clear separation, and I suggested cheesemanni because of vein count, and inflorescence length.
   19 Feb 2019
Like a lot of theses new species, specimens from outside the area of collectiom when the original paper was written can often fall between, which suggests they should not have been separated in the first place.
The length I mentioned of 0.8 cm is in the Vicflora key, which separates sulcatus from two other species. The Vicflora article on cheesemanii states the length is 1.5-5 cm..

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Location information

  • Coordinates 149.154922-35.232125
  • Altitude 589.9m
  • Places Watson, ACT

Species information

  • Not Sensitive
  • Local Native
  • Non-Invasive

Sighting information

  • 16 - 100 Abundance
  • 18 Feb 2019 4:07 PM Recorded on
  • JaneR Recorded by
  • Website Reported via
Atlas of Life in the Coastal Wilderness Frogwatch ACT and Region Atlas of Life Budawang Coast
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