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<u>Rumex</u>is a plant genus of the knotweed family (Polygonaceae). Several authors have subdivided Rumex into the subgenera Acetosela, Acetosa, Platipodium and Rumex. In 1967, Loeve and Kapoor proposed elevating these subgenera to genera. Bucephalophora Pau corresponds to the subgenus Platipodium. According to Navajas et al. all Eurasian and American dioecious Rumex species have a single origin and that gynodioecy may have been an intermediate stage on the way to dioeciousness, as seems to be the case with African species.<ref>[http://de.pluspedia.org/w/index.php?title=Ampfer&oldid=880967 Ampfer] on PP</ref>
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