Flowers bisexual (often functionally unisexual in P. amphibia and P. hydropiperoides), 1–14 per ocreate fascicle, base not stipelike; perianth white, greenish
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Persicaria glabra, Persicaria hirsuta, Persicaria hydropiper, Persicaria hydropiperoides, Persicaria lapathifolia, Persicaria longiseta, Persicaria maculosa
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Polygonum hydropiperoides var. adenocalyx (Stanford) Gleason Polygonum hydropiperoides var. asperifolium Stanford Polygonum hydropiperoides var. breviciliatum Fernald
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Elliott, Sketch Bot. S. Carolina 1: 455. 1817 Synonyms: Polygonum hydropiperoides var. setaceum (Baldwin) Gleason Polygonum setaceum var. interjectum Fernald
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showed that Persicaria hirsuta is closely related to P. setacea and P. hydropiperoides. Hybrids between P. hirsuta and P. setacea have been produced experimentally
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