Poster
Systematics
Phylogenomics of the genus Asparagus reveals many instances of paraphyly with narrowly distributed taxa nested within locally widespread species complexes
Presenting Author
Philip Bentz
Description
Paraphyletic species relationships are problematic for taxonomic purposes but may represent true evolutionary phenomena in which new species form from within a larger species complex. Across the Asparagus phylogeny, there are multiple instances of new species forming via divergent population(s) from within a larger species complex. In many cases branching patterns within such complexes are polytomous. Here, we explore the implications of these results from a recent phylogenomic analysis of the genus Asparagus, focusing on a clade containing Asparagus exuvialis Burch. - a species widespread across southern Africa. Using over 1,700 nuclear loci in phylogenomic analyses, A. exuvialis is paraphyletic with two other distinctive species that are more narrowly distributed.