Abstract
The systematics and phylogeny of the genusCochlearia and allied genera are unsettled. There are no clearly defined genera and subtribal structures to determine subtribeCochleariinae in respect to subtribeThlaspidinae. The use of morphological data, such as fruit form or embryo characters have resulted in contradictory taxonomic concepts in the past due to their homoplastic nature. We investigated all sections of genusCochlearia recognised in the most common concepts, as well as some genera such asIonopsidium, Bivonaea, Pastorea andThlaspi s. l. pro parte. Previous studies based on molecular data and morphological studies have shown close relationships between taxa from subtribeCochleariinae andThlaspidinae. The Internal Transcribed Spacer regions of the nuclear encoded ribosomal DNA operon and the plastidictrnL intron were sequenced from a number of genera. A molecular phylogeny was derived and compared to traditional classification systems. These data grouped sections ofCochlearia outside theCochlearial Ionopsidium core group and integrated them either closely to genusNoccaea in subtribeThlaspidinae (sect.Pseudosempervivum) or positioned them outside both theCochlearia core group and theThlaspi s. l. clade (sect.Hilliella). The molecular data indicate that subtribal arrangements in tribeLepidieae are artificial and do not reflect evolutionary history. The genusCochlearia is represented by sectionsCochlearia andGlaucocochlearia and the genusIonopsidium should be integrated intoCochlearia.
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Koch, M., Mummenhoff, K. & Hurka, H. Molecular phylogenetics ofCochlearia (Brassicaceae) and allied genera based on nuclear ribosomal ITS DNA sequence analysis contradict traditional concepts of their evolutionary relationship. Pl Syst Evol 216, 207–230 (1999). https://doi.org/10.1007/BF01084399
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DOI: https://doi.org/10.1007/BF01084399