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Schuster, T.M., J.L. Reveal, M.J. Bayly, and K.A. Kron. 2015. An updated molecular phylogeny of Polygonoideae (Polygonaceae): relationships of Oxygonum, Pteroxygonum, and Rumex, and a new circumscription of Koenigia. Taxon 64: 1188-1298.