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Service Notice

The Western Australian Herbarium’s collections management system, WAHerb, and DBCA’s flora taxonomic names application, WACensus, have been set to read-only mode since 1 October 2025. Recent taxonomic changes are not currently being reflected in Florabase, herbarium collections, or the census. The project team is now conducting testing of the migrated data, and a further update will be provided by the end of the financial year (1 July). Please reach out to us if you have any questions or concerns.

The notice period started at 9:45 am on Friday, 12 December 2025 +08:00 and will end at 12:00 pm on Wednesday, 1 July 2026 +08:00.

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Cyperus difformis L.
Rice Sedge

Reference
Cent.Pl. 2:6 (1756)
Conservation Code
Not threatened
Naturalised Status
Native to Western Australia
Name Status
Current

Tufted annual, grass-like or herb (sedge), 0.05-0.7 m high, spikelets 3-8 mm wide, arranged in clusters; glumes c. 0.6 mm long, almost truncate; stamens 1 or 2. Fl. green-brown-black, Feb or May to Sep. Sand, black or red clay, brown loam. Along watercourses.

Helen Coleman, Descriptive Catalogue, 14 December 1998

Distribution

IBRA Regions
Carnarvon, Central Kimberley, Central Ranges, Dampierland, Darwin Coastal, Gascoyne, Great Sandy Desert, Northern Kimberley, Ord Victoria Plain, Pilbara, Victoria Bonaparte.
IBRA Subregions
Ashburton, Augustus, Berkeley, Carnegie, Chichester, Fitzroy Trough, Fortescue, Hamersley, Hart, Keep, Mann-Musgrave Block, McLarty, Mitchell, Mount Eliza, Pentecost, Purnululu, Roebourne, Wooramel.
IMCRA Regions
Kimberley.
Local Government Areas (LGAs)
Ashburton, Carnarvon, Derby-West Kimberley, East Pilbara, Halls Creek, Karratha, Meekatharra, Ngaanyatjarraku, Port Hedland, Wiluna, Wyndham-East Kimberley.