present or absent. Flowers bisexual (often functionally unisexual in P. amphibia and P. hydropiperoides), 1–14 per ocreate fascicle, base not stipelike;
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genusPersicaria sectionPersicaria sect. Persicaria Show Lower Taxa Persicaria amphibia, Persicaria bicornis, Persicaria careyi, Persicaria glabra, Persicaria
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tribe Cardamineae genusRorippa Show Lower Taxa Rorippa alpina, Rorippa amphibia, Rorippa aquatica, Rorippa austriaca, Rorippa barbareifolia, Rorippa calycina
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amphibium Linnaeus Sp. Pl. 1: 361. 1753 Synonyms: Persicaria amphibia var. emersa (Michaux) J. C. Hickman Persicaria amphibia var. stipulacea (N. Coleman) H. Hara Persicaria
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657. 1753 Synonyms: Armoracia amphibia (Linnaeus) Petermann Brachiolobos amphibius (Linnaeus) Allioni Cochlearia amphibia (Linnaeus) Ledebour Myagrum amphibium (Linnaeus)
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