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A novel phylogenetic infrageneric classification of Baccharis (Asteraceae: Astereae), a highly diversified American genus
Author(s) -
Heiden Gustavo,
Antonelli Alexandre,
Pirani José Rubens
Publication year - 2019
Publication title -
taxon
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 81
eISSN - 1996-8175
pISSN - 0040-0262
DOI - 10.1002/tax.12128
Subject(s) - subgenus , baccharis , monophyly , biology , genus , taxon , phylogenetic tree , zoology , clade , evolutionary biology , botany , asteraceae , biochemistry , gene
We present the hitherto most comprehensive phylogenetic hypothesis for Baccharis . Our results confirm that subtribe Baccharidinae is a monogeneric group and support a broad circumscription of Baccharis as monophyletic with the inclusion of all genera that have been previously segregated from it ( Baccharidastrum , Baccharidiopsis , Heterothalamulopsis , Heterothalamus , Lanugothamnus ). We provide comprehensive lists of accepted and synonymized infrageneric taxa. Seven main lineages are recognized, which we treat as subgenera. Subgenera Baccharis and Molina roughly match previous circumscriptions, while subgenera Pteronioides and Stephananthus are merged with Molina . In total, we propose that Baccharis comprises 440 species classified into 7 subgenera and 47 sections, while 22 sections are considered synonyms. The phylogeny provided constitutes the basis for further exploration of the evolutionary processes that have allowed the group to attain its wide geographic distribution, morphological variation, variable sexual reproductive strategies, and complex chemical contents.