Alternanthera philoxeroides

Alligator Weed at Melba, ACT

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Identification history

	Alternanthera philoxeroides	16 Feb 2024	JaneR
	Alternanthera philoxeroides	16 Feb 2024	pinnaCLE

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User's notes

4 large clumps growing on Ginninderra Creek under the pipe bridge for the new Belco Trunk Sewer. Each clump must have 100 growing stems in a tangle to 1 m long. Clumps are on the bank above water level though the lowest stems end in the water. Other stems are relatively erect. The location is where a new channel was dug in at the end of sewer construction and could have activated the vigorous growth. Cannot see other plants at a quick look up or downstream.

2 comments

JaneR wrote:

16 Feb 2024

Disturbing. This is the second new appearance reported in CNM this week.

pinnaCLE wrote:

12 Apr 2024

HarleyB at Biosec & Rural Services marked this place on 25 Mar on weeds-to-treat site (same date as his sighting of nearby patch of Symphiotrichum), along with many more alligator-weed occurrences along Ginn Ck in Melba. Looks to be a weed that requires treatment asap once it is reported if control is the objective. This population of plants will all have been invigorated, and maybe some stems detached and implanted lower in the catchment, by the water torrent for a few days after heavy rain on 06 April. Literature suggests that the species in Australia does not set viable seed but does propagate from plant fragments.

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Location information

Coordinates 149.050677 -35.218856
Places Melba, ACT

Sighting information

5 Abundance
16 Feb 2024 01:10 PM Recorded on
pinnaCLE Recorded by
Collections
Plants Other Fresh Water Plants pinnaCLE Canberra & Southern Tablelands NatureMapr

Additional information

30cm to 1 metre Plant height
True In flower

Species information

Alternanthera philoxeroides Scientific name
Alligator Weed Common name
Not Sensitive
Exotic
Major weed or pest
Up to 630m Recorded at altitude
Machine learning
External link More information

Record quality

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

Australian Capital Territory

New South Wales

Queensland

Northern Territory

Western Australia

South Australia

Victoria

Tasmania