Photo: Rumex hymenosepalus.

Flowering plants, with an big yellow-flowering (-fruiting?) barrel cactus in the background. Tucson, AZ, US. Wild. 1998-03-01.
Rumex hymenosepalus Torr. Engl.: canaigre dock, canaigre, tanner's dock. Deu.: Gerbampfer. Span.: cañagria
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Photo: Rumex hymenosepalus.