Cyperus congestus

Dense Flat-sedge at Franklin, ACT

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Identification history

	Cyperus congestus	14 Mar 2025	JaneR
	Cyperus	30 Jan 2025	EmilySutcliffe

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User's notes

In the seed production area at Budjan Galindji.

3 comments

JaneR wrote:

14 Mar 2025

Could you make the second photo showing spikelets etc as the main photo ?

EmilySutcliffe wrote:

15 Mar 2025

Hi Jane, I think the photos are switched now. Thanks for the id, is it possibly C.rotundus though? It doesn't looks a bit different to other C.congestus on here.

JaneR wrote:

15 Mar 2025

Hi Emily, Thanks for the check: Cyperus rotundus and C. congestus are both introduced and recorded from suburban Canberra. These have overlapping characteristics, but on re-considering, your plant looks closer to C. rotundus. Is there a chance you could re-visit and confirm ID ? it would be good to get a solid ID especially as hardly any records for CNM.

Things to look for, taken from PlantNet:
involucral bract definitely longer than inflorescence ( = congestus)
3 to 10 spikelets per spike (=rotundus), if "numerous" (= congestus)
glume obtuse and several nerved ( = rotundus) but if acute with 3-4 nerves (= congestus)
nut coloured dark grey-brown(= rotundus) or dark brown to black (= congestus)
Has woody tubers (= rotundus), presumably on mature plants.

Jane

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Location information

Coordinates 149.148014 -35.203264
Altitude 642.0m
Maps Budjan Galindji (Franklin Grassland) Reserve
Places Franklin, ACT

Sighting information

16 - 100 Abundance
2 Apr 2025 08:58 PM Recorded on
EmilySutcliffe Recorded by
Collections
EmilySutcliffe NatureMapr Canberra & Southern Tablelands Rushes, Sedges & Mat Rushes Plants

Additional information

10cm to 30cm Plant height
True In flower

Species information

Cyperus congestus Scientific name
Dense Flat-sedge Common name
Not Sensitive
Exotic
Minor weed or pest
Up to 642m Recorded at altitude
Machine learning
External link More information
Synonyms
Mariscus congestus

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