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We report meiotic chromosome numbers of three taxa in Carex sect. Mitratae in Korea: Carex breviculmis R. Br. (n = 32 II , 33 II , 34 II ), C. polyschoena H. Lév. & Vaniot (n = 37 II, 38 II ), and C. sabynensis Less. ex Kunth (n = 27 II ). Section Mitratae is one of the most species-rich Asian groups in Carex, comprising approximately 45–80 taxa. Twenty-seven of these occur in Korea, and they are some of the most challenging taxa to identify due to their obscure and inconspicuous diagnostic characters. Including the counts reported here, half of the native Korean sect. Mitratae chromosome numbers have been documented. Their haploid chromosome numbers range from n = 10 to n = 40, and many exhibit variations in the numbers counted within a taxon. These variations, along with the overall significant variation in sect. Mitratae, suggest that dynamic chromosome activity may be related to the high species diversity of Carex.

Chromosome number report of three Carex sect. Mitratae taxa (Cyperaceae) in Korea