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Schoenoplectus pungens
Schoenoplectus pungens is a species of flowering plant in the sedge family Cyperaceae, commonly known as common three-square, common three-square bulrush, and sharp club-rush. It is a long-lived perennial herb up to 1.5 m tall, found in open, sun-lit marshes and along the shores of lakes and ponds, in water up to 1 m deep. It is resistant to fire. The flowerhead/seedhead consists of one or several oval shaped spikelets. They are in a tight cluster near the top of the "triangular-shaped" stem, brown in colour, and growing on one side of the stem. Flowers are blue. This is also a wetland indicator species. PS: A similar species and second ID possibility is Schoenoplectus mucronatus - Star Club Rush.
This spotting was at the marshy lakes edge of Lake Manchester, a freshwater reservoir west of Brisbane. It is located in Brisbane Forest Park, an area of dense native bushland and subtropical rainforest. Sunny, exposed location, subject to wind and wave action. Most plants have roots that are either very moist or completely submerged in water.
A good site for sedge and rush species found in Australia, including some excellent images of this particular species - https://canberra.naturemapr.org/Communit...
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