ceratophorus Ledebour Icon. Pl. 1: 9, plate 34. 1829 Synonyms: Taraxacum ambigens var. fultius Fernald Taraxacum angulatum G. E. Haglund Taraxacum arctogenum Dahlstedt
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and: R. canadensis (R. ×novanglicus L. H. Bailey); R. flagellaris (R. ×ambigens Fernald, R. ×distinctus L. H. Bailey, R. ×elongatus Brainerd & Peitersen
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E. macrostachya, E. erythropoda, E. uniglumis, E. kamtschatica, and E. ambigens. Two or more of these species have been combined by recent authors. The
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(R. ×lepagei L. H. Bailey, R. ×rixosus L. H. Bailey); R. hispidus (R. ×ambigens Fernald, R. ×distinctus L. H. Bailey, R. ×elongatus Brainerd & Peitersen
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