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Service Notice

The Western Australian Herbarium’s collections management system, WAHerb, and DBCA’s taxonomic names application, WACensus, have been set to read-only mode since 1 October 2025. Recent taxonomic changes are not reflected in Florabase, herbarium collections, or in the census. We are hoping to be able to reinstate services around December 15; we will provide an update at that time.

The notice period started at 9:00 am on Wednesday, 1 October 2025 +08:00 and will end at 12:00 pm on Monday, 15 December 2025 +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.