Lehtonen, Samuli (2009). "An integrative approach to species delimitation in Echinodorus (Alismataceae) and the description of two new species". Kew Bulletin. 63 (4): 525–563. doi:10.1007/s12225-008-9068-0. ISSN0075-5974.
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Lehtonen, Samuli (2009). "An integrative approach to species delimitation in Echinodorus (Alismataceae) and the description of two new species". Kew Bulletin. 63 (4): 525–563. doi:10.1007/s12225-008-9068-0. ISSN0075-5974.