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Cyperus diandrus
Also called Low Cyperus, Low Umbrella Flatsedge
Cyperus diandrus, also known as umbrella flatsedge, is a species of flowering plant in the sedge family Cyperaceae. It is native to northeastern North America, ranging from the Maritime provinces of southeastern Canada southward to Virginia, reaching as far west as Nebraska. It is often confused with Cyperus bipartitus, both of which have chestnut-brown scales protecting the flowers. Its season runs from July to October but little else is known about its ecology.
Cyperus diandrus was named and described by John Torrey in 1818. The common name refers to the umbrella-like shape of its flower cluster, known to botanists as an umbel. The specific epithet diandrus suggests that each flower has "two stamens" (pollen-bearing organs), which is also true of various other species of flatsedges. In Canada, it is referred to as low umbrella flatsedge (French: souchet diandre).
Since Cyperus diandrus is often confused with other species, range maps should be interpreted with care. For example, in 1960, many Illinois specimens labeled as Cyperus diandrus were found to be misidentified. The species was subsequently found to occur in just eight Illinois counties.
Cyperus absconditicoronatus · Cyperus acholiensis · Tapertip flatsedge · Cyperus afroalpinus · Cyperus afrodunensis · Cyperus afromontanus · Cyperus afrovaricus · Inflatedscale flatsedge · Cyperus ajax · Cyperus alaticaulis · Cyperus albopilosus · Cyperus albopurpureus
Text excerpted from the Wikipedia article Cyperus diandrus by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
