Cyperus involucratus, Fam. Cyperaceae
Perennial sedge to 1m tall with short creeping rhizomes and tufted erect glabrous ridged stems, 3-5mm thick; cylindrical or triangular below seed heads. Previously Cyperus flabelliformis.
Other invasive plants
Invasive plants that are not prohibited or restricted invasive plants, but are known to spread readily and cause negative impacts, within the region.
|Form or habit:||Sedges, Rushes and allies|
Simple, basal, reduced to long sheaths.
|Flower description:||Fawn to reddish brown in compound umbels with numerous rays to 100mm long, as well as many dark green leaf-like bracts to 400mm long, radiating like the spokes of an umbrella from the top of the stem. Rays terminate in groups of spikelets each producing 20-40 yellowish-brown, oval nuts, triangular in cross-section, 0.8-0.9 x 0.4-0.5mm.|
|Fruit description:||Rays terminate in groups of spikelets each producing 20-40 yellowish-brown, oval nuts, triangular in cross-section, 0.8-0.9 x 0.4-0.5mm.|
|Food source for:|
|Toxicity:||No toxicity known|
|Notes:||Spread by: nuts and vegetative material in garden waste, water, contaminated soil. Invades/threats: damp areas, creek banks and in water up to 400mm deep. Notes: originally a horticultural ornamental. Known to be naturalised in a number of waterways within this region. Once established is very persistent, forming extensive colonies that impede water flow. Environmental weed.|
|Information sources:||Mackay Regional Pest Management Group (2018) Weeds of the Mackay Whitsunday Region Second Edition.|