What I am asking for is lineages that a few million years ago dispersed to North or South America, somehow became allopolyploids (for instance after hybridisation with indigeneous species), and then started diversifying to produce more daughter lineages/taxa.
Even though such scenarios must be common, I know of a few cases only (Geranium, Gossypium, Silene, Viola) and it is hard to find more without screening lots of literature.
Woody bamboos are another example. This paper came out last year that talks about the Independent allopolyploidization events preceded speciation in the temperate and tropical woody bamboos. This might be helpful.
Article Independent allopolyploidization events preceded speciation ...
My example would be Silene (verecunda complex in particular), but I see that it is already on your radar. We described a new species (Silene krantzii) that is part of this complex and discuss some aspects of the radiation in our paper. These species are included in the section that extends into South America. Unclear just how many 'daughter lineages' we are talking about, but I know it is more than is currently recognized!
Article Recognizing a new species of Silene (Caryophyllaceae) from C...
Maybe our recent article about Suaeda that so far is not yet available in the printed version might be of interest for you: Brandt R, Lomonosova M, Weising K, Wagner N, Freitag H. Phylogeny and biogeography of Suaeda subg. Brezia (Chenopodiaceae / Amaranthaceae) in the Americas.2015. Plant Syst Evol. DOI10.1007/s00606-015-1233-y.
But we are not sure if the Americas were colonized by diploid or already by tetraploid ancestors. However, we are sure that polyploidiaziation on that continent only happened among the colonizers as there are no traces of any indigineous taxa.
If you have problems in getting the article downloaded, I easily could send it to you by e-mail.
Kind regards, Helmut Freitag
Try grasses. By now we have evidence on the genus Munroa DOI: 10.1111/boj.12304
we will have next year of Deschampsia.
cheers Jorge
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