Scirpus cyperinus, commonly known as woolgrass, is a herbaceous emergent that is native to the eastern United States and eastern Canada. Other common names include cottongrass bulrush and brown woolly sedge.
This sedge is very variable in appearance. In general, it produces short, tough rhizomes and grows in dense clumps. The fertile stems grow upright. There are five to ten leaves per stem. They are up to 80 centimeters long by 1 centimeter wide. The proximal ones have green or reddish sheaths. The inflorescence has upright or spreading branches bearing cymes of up to 15 spikelets each. The spikelet is cylindrical or oval and measures up to 0.8 centimeters in length. It is covered in reddish, brownish, or black scales. The flowers have six long bristles each, making the inflorescence look woolly.
- Peter W. Ball, A. A. Reznicek & David F. Murray (2002). "Scirpus cyperinus (Linnaeus) Kunth, Enum. Pl. 2: 170. 1837". Magnoliophyta: Commelinidae (in part): Cyperaceae. Flora of North America North of Mexico. 23. Oxford University Press. ISBN 978-0-19-515207-4.
- Scirpus cyperinus. NatureServe.
- Scirpus cyperinus. Washington Burke Museum.
- Scirpus cyperinus. University of Michigan Ethnobotany.
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