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Rhynchospora   mesoatlantica    sp. nov.  (  Cyperaceae  ) is described, illustrated, and compared with morphologically similar species.    Rhynchospora   mesoatlantica    is known only from southern Delaware, southeastern Maryland, and southern New Jersey, all within the Mid-Atlantic region of the U.S.A. It inhabits sunny, wet margins of natural, shallow, nutrient-poor, seasonal ponds of the Coastal Plain. Narrow leaf blades; fruits obpyriform in outline; faces of mature fruits possessing a central, pale, well-demarcated disk; and fruit tubercle margins denticulate for most of their lengths indicate    R.   mesoatlantica    is most similar to    R.   filifolia    and    R.   harperi   .    Rhynchospora   mesoatlantica    is unique in its fruit dimensions, scales intermediate in length between    R.   filifolia    and    R.   harperi   , and relatively long fruit stipe. The NatureServe rank of Critically Imperiled and the IUCN rank of Endangered appear warranted for    R.   mesoatlantica    because only six populations are known to be extant, most quite small and isolated; all populations occur within a small geographic area; populations have declined; and serious threats confront the survival of the species.

﻿ Rhynchospora mesoatlantica ( Cyperaceae ), an imperiled new species of beaksedge from eastern U.S.A.

Rhynchospora mesoatlantica ( Cyperaceae ), an imperiled new species of beaksedge from eastern U.S.A.