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Plant Identification Common name: dirty dora, rice sedge, variable flatsedge Botanical Name: Cyperus difformis Family name: Cyperaceae Location: Windsor, NSW Date: 11th April 2009 Collector: John Poulakis  Habitat: A native of Asia this annual plant is widespread throughout Australia and most common in the southern irrigation areas. May grow and flower year round and is present through much of the cotton growing areas. A prolific seed producer.  Economic significance: Is a major weed in rice production and categorised as a pest in irrigation structures.