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Single most parsimonious tree (72 steps) of a subset of Myriophyllum species illustrating M. heterophyllum × M. pinnatum hybrids (including sequence clones from hybrid populations in bold) constructed from entire nrITS sequence data (CI: 0.972; RI: 0.986). Numbers above branches refer to branch lengths. Characters after species names refer to states (U.S.) and accession numbers for collection localities.
