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Adn y sus bases of dating


Sequences of the ribosomal DNA internal transcribed spacer ITS region and the chloroplast DNA ycf 3 -trn S intergenic spacer were determined for samples representing Chilean and non-Chilean Adn y sus bases of dating of western American Portulacaceae and their outgroups. The data refine previous inferences of generic circumscriptions and interrelations.

In particular, the data reveal that an earlier circumscription of Cistanthe Spach is polyphyletic and also reveal a North American clade comprising Claytonia L. Govaerts, and Montia L. Within the South American genera, two patterns emerge from the data: The patterns can be evaluated in terms of two phenomena: In the latter case, the gene tree patterns may distort the true timing and cladistic pattern of morphological and ecological diversification.

At present, the degree to which evidence for hybridization among the Chilean Portulacaceae will prove to be the rule or the exception is unclear. Nonetheless, spatial and temporal ecological patterns in Chile generally favor hybrid formation and persistence. The term "western American Portulacaceae" refers to a group of ca. Genera included in this group are Calandrinia Kunth, Calyptridium Nutt. Monophyly of the group remains unresolved and depends upon the relations of Phemeranthus Raf.

Species diversity of western American Portulacaceae is divided approximately equally between North America and South America, and much of it is concentrated in California and northern Chile.

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