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Abstract Detail

Floristics & Taxonomy

Heiden, Gustavo [1].

Baccharis (Asteraceae, Astereae): updated diversity and distribution data.

Baccharis is a monophyletic genus characterized by functionally unisexual florets, generally distributed in distinct individuals (dioecy), but also including monoecious, gynodioecious and polygamous species. The genus has not been revised taxonomically as a whole in almost the past two centuries. Recent country or dependent territory level checklists are hardly comparable and mostly outdated. To fill up this gap, a comprehensive updated checklist on the diversity and distributions of Baccharis at generic, infrageneric and specific levels, including putative hybrids, and adventitious occurrences is needed. Based on literature and herbaria revision, Baccharis comprises 442 species classified into 47 sections and seven subgenera. The genus is native in the Americas, from southeastern Canada and northwestern USA to Tierra del Fuego, with species native to the Falkland/Malvinas islands, across most of the Caribbean islands and the Galápagos archipelago. The comparison of updated complete lists of species per countries and territories highlights Brazil (185 species, 114 endemics), Argentina (110 species, 25 endemics), and Bolivia (76 species, 22 endemic) as the richest countries for the genus. Four species are highlighted for occurring in more than 10 countries or territories within their native range (B. dioica, B. pedunculata, B. trinervis, B. salicifolia), while at least 218 species are restricted to a single country or territory. The role of hybridization in the genus diversity, ecology and evolution is still a neglected subject and 38 putative hybrid taxa were described so far. Some species were spread outside the American continent by anthropogenic dispersals and at least two have established naturalized alien populations: B. halimifolia in Europe and Oceania and B. spicata in Europe.

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A comprehensive phylogenetic hypothesis for the predominantly Neotropical American genus Baccharis L. is necessary to test its monophyly, clarify the infrageneric relationships within the genus and shed light on its evolutionary and biogeographical histor

1 - Embrapa Clima Temperado, Herbarium ECT, Rodovia BR 392, km 78, Caixa Postal 403, Pelotas, RS, 96010-971, Brasil


Presentation Type: Oral Paper
Session: FTII, Floristics & Taxonomy II
Location: Virtual/Virtual
Date: Wednesday, July 21st, 2021
Time: 12:45 PM(EDT)
Number: FTII002
Abstract ID:550
Candidate for Awards:None

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