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Browsing Conference presentations by Author "Akimana, Solange"

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    Systematics of southern African Anthemideae (Asteraceae): generic and subtribal relationships of subtribes Athanasiinae and Phymasperminae and the placement of Inulanthera
    (2019-08-21) Akimana, Solange; Boatwright, J.S.; Magee, A.R.
    Phylogenetic analyses of the tribe Anthemideae have demonstrated that the southern African contingent of this tribe represent its earliest diverging lineages and, as such, southern Africa has been hypothesised as the cradle of this now largely Northern Hemisphere tribe. Ongoing studies have focused on unravelling relationships among the southern African subtribes, especially Athanasiinae and Phymasperminae. Previous studies based on limited sampling have indicated that the circumscriptions of these two subtribes are in need of re-assessment as Athanasiinae may not be monophyletic and the placement of Phymasperminae differs between nuclear and plastid datasets. The present study aimed at expanding the datasets for these two subtribes based on two nuclear (ITS and ETS) and two chloroplast (rpl32-trnL and 3’rps16-5’trnK) regions, including a representative sampling from other subtribes within Anthemideae. The data indicate that Phymasperminae is embedded within Anthanasiinae, and that the two subtribes form a monophyletic group indicating that they may be better treated as a single subtribe. Within Phymasperminae, Gymnopentzia and Eumorphia should be included within Phymaspermum. In Athanasiinae Asaemia was placed within Athanasia contrary to other studies indicating that it does not warrant generic status. Inulanthera was shown to have a fairly isolated position within the tribe and that it warrants recognition as the new subtribe Inulantherinae. Detailed phylogenetic relationships and characters supporting these alternative taxonomic hypotheses will be discussed.