Rhynchospora rugosa
Rhynchospora rugosa, known by the common name of claybank beaksedge, is a member of the sedge family, Cyperaceae. It is a perennial herb, native to Central and South America. While Plants of the World Online accepts the African Rhynchospora brownii as an extant species, it is considered to be a subspecies of Rhynchospora rugosa by the Global Biodiversity Information Facility. References

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rugosa
Flora of Southern America
Flora of Central America
Flora of the Caribbean
Flora of Hawaii
Plants described in 1798
Plants described in 1944