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Abstract Detail


Porter, J. Mark [1], Cuellar, Fernando [1].

Into the tropics: Orgin and diversification of Loeselia (Polemoniaceae).

Hypotheses for the origin of temperate lineages of Polemoniaceae made by Verne Grant have placed the genus Loeselia as the pivotal genus linked to this diversification. We address this hypothesis in the context of historical biogeography of Loeselia. To do so, we employ 54 nuclear genes, sampled from across the genome, plastome sequences and the nuclear ribosomal repeat unit of species that represent the early diversification of tribe Loeselieae and Loeselia in particular. We show that key diversification events of Loeselieae predate the onset of diversification of extant Loeselia, making it unlikely that Loeselia played a direct role. BayArea-like models provide a better fit to our data than do DEC or DIVA-like models of historical biogeography. The BayArea-like model with founder-dispersal, the best-fit model, provides an inference that the common ancestor of Loeselia was associated with tropical dry forests and/or temperate montane forests of the Mexican tropics, 13.9 (12–21) mya. While this is consistent with Grant's hypothesis, deeper nodes of the phylogeny are inferred to be the southern basin and range of U.S (33.7 mya), which represent a contradiction.

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1 - Rancho Santa Ana Botanic Garden, Research and Graduate Education, 1500 N. COllege Ave., Claremont, CA, 91711, USA


Presentation Type: Oral Paper
Session: 37, Systematics II: Caryophyllids & Basal Asterids
Location: Sundance 4/Omni Hotel
Date: Wednesday, June 28th, 2017
Time: 11:45 AM
Number: 37007
Abstract ID:449
Candidate for Awards:None

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