Nelmesia is a monotypic genus of flowering plants belonging to the family Cyperaceae. The only species is Nelmesia melanostachya .
It is native to Zaire.
The genus name of Nelmesia is in honour of Ernest Nelmes (1895–1959), an English botanist, gardener and librarian. He worked at Kew Gardens in the herbarium and library, he was also a specialist in Carex and Cyperaceae. Both the genus and the species were first described and published in Bull. Jard. Bot. État Bruxelles Vol.25 on page 143 in 1955.
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