Somatic chromosome numbers of four <i>Eleocharis</i> taxa from Korean populations (Cyperaceae)

<i>Eleocharis</i> R. Br. (Cyperaceae) is characterized by unbranched culms, one terminal spikelet, bisexual flowers, and bristly perianths, occurring mainly in circumboreal marshes wetlands. There are about 250 species worldwide, 15 taxa Korea have been recognized. Chromosomes Cyperaceae known to be holocentric, missing constricted centromeres during cell division. For the first time, we report chromosome counts of from Korean populations <i>E. attenuata</i> f. <i>laeviseta</i> (Nakai) H. Hara (2<i>n</i> = 20); parvula</i> (Roem. & Schult.) Link ex Bluff, Nees Schauer 10); ussuriensis</i> Zinserl. 16); valleculosa</i> var. <i>setosa</i> Ohwi 16). The exhibit variations their sizes ca.1.7 μm ca. 6 μm, categorized as gradient bimodal karyotypes. karyotypes observed congruent with previous phylogenetic groups proposed. To clarify traditional classification <i>Eleocharis</i>, further taxonomic chromosomal investigations additional taxon sampling efforts required.