Synonyms: Lapathum mexicanum (homotypic); Rumex angustifolius (heterotypic); Rumex hastulatus (homotypic); Rumex mexicanus; Rumex mexicanus var. angustifolius; Rumex mexicanus var. triangulivalvis (homotypic); Rumex quadrangulivalvis; Rumex salicifolius mexicanus (homotypic); Rumex salicifolius triangulivalvis (homotypic); Rumex salicifolius var. angustifolius; Rumex salicifolius var. angustivalvis; Rumex salicifolius var. mexicanus (homotypic); Rumex salicifolius var. triangulivalvis (homotypic); Rumex salicifolius var. unigranis; Rumex triangulivalvis f. unigranis; Rumex triangulivalvis var. oreolapathum