Abstract
A comparative morphological study of Hydrocharis L. species has been carried out. Based on the results of cluster analysis for 77 morphological characters, the isolation of H. chevalieri (De Wild.) Dandy from other members of Hydrocharis L., the autonomy of the Limnobium Rich., and the validity of combining Limnobium and Hydrocharis into the subfamily Hydrocharitoideae Eaton. are demonstrated. Important diagnostic features for species of Hydrocharis are the shape of its apex, the shape and size of its leaf blade, the proportion of honeycomb aerenchyma, the length of petiole, the size of fruits and seeds, and the thickness of pericarpium. Two groups of rosette vegetatively mobile biomorphs are defined: low annual(oligoennial) free-floating turioniferous hydatophytes (H. morsus-ranae L., H. dubia (Blume) Backer) and medium–high annual(oligoennial) rooting hydrohelophytes (H. chevalieri (De Wild.) Dandy).
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ACKNOWLEDGMENTS
We are grateful to B.F. Sviridenko (Omsk State Pedagogical University, Omsk, Russia) and A.V. Filonenko (researcher, Moscow, Russia) for discussions on the manuscript; to reviewers for their valuable remarks; to curators of herbaria (Appendix, Table 1S) P.D. Tropinina and A.V. Khval (Komarov Botanical Institute, Russian Academy of Sciences, St. Petersburg, Russia) for assistance in working with the paleontological collection, J.-P. Ghogue (researcher, Yaoundé, Cameroon) for help in sampling live materials and for photographs of H. chevalieri, and S.F. Funnikova (Khabarovsk, Russia) for her help in sampling H. dubia materials. We are also grateful to A.I. Mikhaltsov (Children’s Ecological and Biological Center, Omsk, Russia) for help with preparing micropreparations and micrographs.
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Efremov, A.N., Grishina, V.S., Toma, C. et al. Comparative Morphology of the Genus Hydrocharis L. (Hydrocharitaceae). Inland Water Biol 14, 638–651 (2021). https://doi.org/10.1134/S1995082921060031
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DOI: https://doi.org/10.1134/S1995082921060031