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

ABSTRACT: Rhynchosporamesoatlanticasp. nov. (Cyperaceae) is described, illustrated, and compared with morphologically similar species. Rhynchosporamesoatlantica 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. Rhynchosporamesoatlantica is unique in its fruit dimensions, scales intermediate in length between

SUBMITTER: Treher Eberly A 

PROVIDER: S-EPMC10709811 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature