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Babcock, E. B. 1947. The genus Crepis. Part two. Systematic treatment. Univ.Calif.Publ.Bot. 22, 198-1030.° and Babcock, E. B. & Jenkins, J. A. 1947. Chromosomes and phylogeny in Crepis. III. The relationships of one hundred and thirteen species. Univ.Calif.Publ.Bot. 18[12], 241-292.° under Crepis jacquini Tausch