University of Isfahan Taxonomy and Biosystematics 3115-9001 12 44 2020 09 22 Vallisneria Denseserrulata Makino (Hydrocharitaceae) in Iran: A New Record Confirmed by nrITS and matK/trnK 5' Intron Data گونۀ Vallisneria denseserrulata Makino از خانوادۀ Hydrocharitaceae در ایران: رکورد جدید تأییدشده توسط داده‌‌های nrITS و matK/trnK5´intron 23 32 25457 10.22108/tbj.2021.127064.1148 EN Mahsa Abdi Ph. D. Student of Plant Systematic Biology, Department of Plant and Animal Biology, Faculty of Biological Science and Technology, Isfahan, Iran Saeed Afsharzadeh Associate Professor, Department of Plant and Animal Biology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran Hojatollah Saeidi Associate Professor, Department of Plant and Animal Biology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran Journal Article 2021 01 18 Two specimens of <em>Vallisneria denseserrulata</em> from the southeastern part of the Seimareh River in the Iranian province of Ilam were documented as new records for the flora of Iran. The maximum likelihood phylogenetic analyses of the specimens using DNA Sequence data from nuclear internal transcribed spacer (nrITS) and the plastid <em>mat</em>K and <em>trn</em>K 5' intron gene regions revealed that the specimens are not conspecific with <em>V. spiralis </em>that has long been regarded to be the sole representative of the genus in Iran. Although their quite similar appearances do not preclude the possibility of the two siblings as being misidentified with each other, the fact that <em>Vallisneria</em> species are highly cultivated and traded commercially around the world, as well as its resolution within the clade containing the cultivated material of unknown provenance, left open the possibility of it being an escapee from cultivation which has established and naturalized in the region. https://tbj.ui.ac.ir/article_25457_deafda89e37c8ea9a2fff3c8fc5ac216.pdf