Molecular Phylogenetics and Taxonomy of the Genus Thysanocarpus (Brassicaceae)

作者：Alexander Patrick J^*; Windham Michael D; Govindarajulu Rajanikanth; Al Shehbaz Ihsan A; Bailey C Donovan

来源：Systematic Botany, 2010, 35(3): 559-577.

DOI：10.1600/036364410792495926

• Fruit morphology
• hybrid speciahon
• nuclear ribosomal ITS
• Thelypodieae
• trnL-F

The relationships and taxonomy of the genus Thysanocarpus (Brassicaceae) are reassessed based on molecular phylogenetic analyses of nuclear ribosomal (ITS) and chloroplast (trnL-F) sequences and a critical re-examination of morphology and nomenclatural types Based on these results, Thysanocarpus is well-supported as a member of tribe Thelypodieae, but no illuminating phylogenetic structure is found within the tribe The independent origin of similar fruit morphology in Thysanocarpus and Athysanus is confirmed Within Thysanocarpus, seven species are recognized T conchuliferus, T curvipes, T desertorum, T erectus, T lacmiatus, T radians, and T. rigulus comb nov Thysanocarpus lacniatus is found to have originated through hybridization However, T deseriforum and T rigidus, which have pieviously been included within lacmiatus (as T lacimatus var lutchcocku and T lacimatus var rigulus, respectively), do not share that species' hybrid origin and ale distinct both phylogenetically and morphologically Within T curvipes, five subspecies are recognized T enmities subsp amplectens comb nov, T cm-tripes subsp curvipes, curvipes subsp eiegans comb nov, curvipes subsp longistylus comb nov, and T curvipes subsp eradiatus comb nov Thysanocarpus curvipes subsp Organs and T. curvires subsp longistylus form clades in ITS and/or trnL-F cladograms as well as showing morphological distinction The remaining three subspecies are recognized based on a combination of morphology and geogrphy

• 出版日期2010-9