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Article title
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Abstract
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Key words
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Introduction
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Materials and methods
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Study area
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Material examined
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Nomenclature and bibliography
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Diagnostic characters
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Taxonomic concept and ranking
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Classification of alien occurrences
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Results
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Overview of historical herbarium collections
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Taxonomic synopsis
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Erigeron politus
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Erigeron × pilosiusculus
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Erigeron rigidus
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Erigeron × intercalaris
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Erigeron acris
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Erigeron droebachiensis
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Erigeron uralensis
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Erigeron brachycephalus
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Identification key
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Excluded taxa
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Discussion
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Diagnostic characters, their value and variability
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Comparisons of taxonomic concepts
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Phenology
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Geographical distributions
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Pathways and periods of introduction of alien species
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Naturalisation and further spread of alien taxa
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Putative hybridisation
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Conclusions
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Acknowledgements
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Additional information
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Conflict of interest
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Ethical statement
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Funding
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Author contributions
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Author ORCIDs
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Data availability
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References
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