Published December 6, 2023
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A new species of Casearia Jacq. (Salicaceae) from Central Panama and insights into its phylogenetic position within the genus
Authors/Creators
- 1. Freie Universität Berlin, Berlin, Germany
- 2. Smithsonian Tropical Research Institute, Ancón, Panama
- 3. Freie Universität Berlin, Berlin, Germany|Universidad de Costa Rica, Cartago, Costa Rica|Universidad de Costa Rica, San José, Costa Rica
- 4. Freie Universität Berlin, Berlin, Germany|Universidad de Panamá, Panama, Panama|Coiba Scientific Station, Ciudad del Saber, Panama
Description
We describe here a new species of Casearia from Panama based on both morphological and molecular data. Casearia isthmica sp. nov. is restricted to the mid-elevation cloud forests of Central Panama and presents morphological similarities with two more widespread species, C. sanchezii from high elevation areas of El Salvador and Mexico and C. tremula from the Caribbean, Central America, and Northern South America. Casearia isthmica differs in presenting pedunculated and congested inflorescences with up to 20 flowers, as well as flowers with 12 stamens and a pubescent style. Phylogenetic analysis based on selected plastid (petD, trnK-matK, rpl16 and rps4-trnLF) and nuclear (GBSSI and ITS) markers shows that the new species belongs to subclade B3 of Casearia, a lineage that encompasses species from Central America, Mexico and the Caribbean. Results of the morphological and molecular analysis were congruent and allowed a broader understanding of this new taxon, especially regarding its relationships to other Casearia.
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