Cyperus eragrostis Lam.
Umbrella sedge (Cyperus eragrostis) is a long-lived, perennial sedge that is native to North and South America. It was introduced to New Zealand as a garden ornamental and was first recorded in the wild (naturalised) in 1871. The plant grows in dense clumps from short rhizomes and has bright green, grass-like leaves arising from the base. It flowers from December to April, producing umbrella-like clusters of yellowish-green to brown spikelets, which develop into small seeds. It tolerates damp conditions, periodic flooding and a range of soil types. It reproduces by seed and vegetatively from rhizomes. Seeds are dispersed by water, contaminated soil and human activities. Rhizomes are spread by soil movement and dumped garden waste.
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