Pondweed at Tennent, ACT
Identification history
| Potamogeton sulcatus | 9 Feb 2022 | michaelb | ||
| Potamogeton sp (cheesemanii or sulcatus) | 18 Jan 2021 | michaelb | ||
| Potamogeton sp. | 12 Apr 2017 | BettyDonWood | ||
| Potamogeton sp. | 12 Apr 2017 | BettyDonWood |
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User's notes
In a dam, on the lower slopes of Mt Tennant.
6 comments
BettyDonWood
wrote:
13 Apr 2017
The flower spikes are too far away for me to count the number of flowers.
JaneR
wrote:
9 Feb 2022
Even in the main photo, most of the leaves are clearly (to me) Ottelia leaves: one leaf in the centre looks probably Potamogeton. The 'flowering spikes' are (I think) dead stems of Eleocharis/Juncus projecting above the water.
i have noticed that, at least in farm dams, these two species (Potamogeton sulcatus and Ottelia ovalifolia) can co-occur. However, they have overlapping but slightly different depth preferences/tolerances, with Ottelia usually in shallower conditions than Potamogeton. Likely Potamogeton is favoured at the moment, after all the recent rains, whereas back in 2017, conditions favoured Ottelia.
Ottelia seems to have quite specific germination conditions, germinating underwater, in about 15-30 cm water (my observations). The young plants are completely submerged and have long thin leaves a bit like Vallisneria, except much smaller.
The lovely showy flowers of Ottelia don't play any part in reproduction. Instead, Ottelia has another type of flower (fully submerged), that self-pollinates.
A separate sighting might be a good idea
i have noticed that, at least in farm dams, these two species (Potamogeton sulcatus and Ottelia ovalifolia) can co-occur. However, they have overlapping but slightly different depth preferences/tolerances, with Ottelia usually in shallower conditions than Potamogeton. Likely Potamogeton is favoured at the moment, after all the recent rains, whereas back in 2017, conditions favoured Ottelia.
Ottelia seems to have quite specific germination conditions, germinating underwater, in about 15-30 cm water (my observations). The young plants are completely submerged and have long thin leaves a bit like Vallisneria, except much smaller.
The lovely showy flowers of Ottelia don't play any part in reproduction. Instead, Ottelia has another type of flower (fully submerged), that self-pollinates.
A separate sighting might be a good idea
michaelb
wrote:
11 Feb 2022
We are looking at the same dam as sighting 4423329 with better photographs. I'll remove the 2nd photo & add a separate sighting.
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Nearby sightings
Location information
- Coordinates 149.058927-35.534544
- Altitude 613.2m
- Maps Namadgi National Park
- Places Tennent, ACT
Sighting information
- 4 - 15 Abundance
- 8 Jun 2015 06:15 PM Recorded on
- michaelb Recorded by
Species information
- Potamogeton sulcatus Scientific name
- Pondweed Common name
- Not Sensitive
- Local native
- Non-Invasive
- Up to 831m Recorded at altitude
- Machine learning
-
In flower
- External link More information
Record quality
- 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
