Rumex conglomeratus often is confused with immature specimens of R. obtusifolius, as well as with other species (e.g., R. sanguineus). Its distribution
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pusillus (= P. × pusilliformis Fisher [P. × intermedius Fischer]), and P. obtusifolius × P. pusillus (= P. × saxonicus Hagström), have been described. Subspecies
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with other species having dentate inner tepals (e.g., R. dentatus, R. obtusifolius, and R. pulcher). Rumex paraguayensis and R. obovatus appear to belong
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midvein, chances are that it is subsp. tenuissimus. Only Potamogeton obtusifolius could be confused with the taxon, and it can be separated by having its
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were based on misidentified specimens of R. conglomeratus or immature R. obtusifolius. Rumex sanguineus is represented in Europe by at least two varieties
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crispus hybridizes with many other species of subg. Rumex. Hybrids with R. obtusifolius (Rumex ×pratensis Mertens & Koch) are the most common in the genus, at
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pusilliformis Fischer [P. × intermedius Fischer]) and P. friesii × P. obtusifolius (= P. × semifructus A. Bennett ex Ascherson & Graebner), have been described
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