The Andean subregion corresponds to south-western South America below 30˚S latitude, extending through the Andean highlands north of this latitude, and comprises five provinces: Subantarctic, Central Chilean, Patagonian, Puna and Paramo. Based on a track analysis of the Andean biota, three main types of distributions were found: (1) no relationship of the Andean subregion with other areas (Andean endemic distributions); (2) relationships with one area or subregion, namely (a) Austral, (b) Tropical and (c) Amphitropical distributions; and (3) relationships with more than one subregion (cosmopolitan distributions). These relationships were described and mapped as individual tracks, based on data from plant and animal taxa. Coinciding individual tracks constitute generalised tracks, which follow three basic patterns: Andean endemic, Austral and Tropical. The first pattern is represented by three generalised tracks, namely (a) along the Puna, Central Chilean, Subantarctic and Patagonian provinces; (b) along the Central Chilean, Patagonian and Subantarctic provinces; and (c) in the Subantarctic and Patagonian provinces. The second pattern (Austral) is represented by two generalised tracks: (a) along the Subantarctic province of South America, south-eastern Australia, and New Zealand and (b) along the Subantarctic province and New Zealand. The third pattern (Tropical) is based on three generalised tracks joining (a) all the Andean subregion with the Neotropical subregion; (b) Paramo and Puna provinces, and the Neotropical subregion; and (c) Patagonian province and Neotropical subregion. The Austral pattern reflects the existence of an ancient Austral biota, with Gondwana events likely to have played a major role in its evolution, whereas the origin of the Neotropical pattern is probably linked to a more recent history, especially the uplift of the Andes and further glaciations. Both of these patterns reveal that the biota of the Andean subregion has a complex or hybrid origin where two different ancestral biological and geological worlds met and combined. The Puna, Patagonian, and Subantarctic provinces appear as panbiogeographic nodes, because of the numerous tracks that cross them, probably due to complex geological events. It is possible that the patterns analysed are the consequence not only of vicariant events promoted by tectonic phenomena, but also of dispersal and/or extinctions that have concealed these events.

Revisión del género Lucilia (Compositae, Inuleae)

Track Analysis Reveals the Composite Nature of the Andean Biota

One hundred and eighty species belonging to 41 families inhabiting the Salado River Basin of the province of Buenos Aires (Argentina) were previously reported to be toxic for cattle. The purpose of this study was to provide a tool to distinguish the taxa when the plant material is desintegrated. In this way, an approach to the identification of these taxa through leaf epidermal features (anticlinal epidermal cell wall patterns, cuticular ornamentation, stomata, and hair types) is performed. A key to the 180 species as well as illustrations of diagnostic characters are given.

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Epidermal characteristics of toxic plants for cattle from the Salado River basin (Buenos Aires, Argentina)

A cladistic and biogeographic analysis of the Lucilia group (Asteraceae, Gnaphalieae)

The Lucilia group sensu Anderberg and Freire comprises nine South American genera: Belloa, Berroa, Chevreulia, Cuatrecasasiella, Facelis, Gamochaetopsis, Jalcophila, Lucilia and Luciliocline. The aims of this contribution were, using DNA sequences from plastid (rpl32-trnL, trnL-F) and nuclear (ITS and ETS) markers, together with morphological characters, to test the monophyly of the Lucilia group and provide new insight into generic circumscriptions. Our studies, including a broad taxon sampling of Gnaphalieae species, suggest that the Lucilia group is paraphyletic, since Antennaria, Chionolaena, Gamochaeta, Loricaria, Micropsis, Mniodes and Stuckertiella are all nested within the Lucilia group. Morphology and molecular analyses combined showed that the traditional generic circumscription of most of the genera (e.g., Berroa, Chevreulia, Chionolaena, Cuatrecasasiella, Facelis, Jalcophila and Micropsis) correlates with the inferred phylogenetic relationships. Conversely, Lucilia and Luciliocline are non-monophyletic. Lucilia is nested in a clade with Berroa, Facelis and Micropsis. Luciliocline is strongly embedded within the clade Belloa pp + Mniodes. Our results are consistent with Dillon’s study that considered Belloa as a montotypic genus (B. chilensis). Luciliocline and the remaining species of Belloa are accommodated in the genus Mniodes, and the necessary combinations are proposed for the expanded Mniodes. All the analyses showed that the monotypic genera Stuckertiella and Gamochaetopsis are in a well-supported clade nested within Gamochaeta, which implies that taxonomic changes are required also for these genera. Internal relationships in the group and the key morphological characters used in the taxonomy of the group, as well as incongruences found between morphological and molecular analyses, are discussed.

The Lucilia group (Asteraceae, Gnaphalieae): phylogenetic and taxonomic considerations based on molecular and morphological evidence

https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1096-0031.1987.tb00510.x

Revisión del género Lucilia (Compositae, Inuleae)

Citations

Track Analysis Reveals the Composite Nature of the Andean Biota

Epidermal characteristics of toxic plants for cattle from the Salado River basin (Buenos Aires, Argentina)

A cladistic and biogeographic analysis of the Lucilia group (Asteraceae, Gnaphalieae)

The Lucilia group (Asteraceae, Gnaphalieae): phylogenetic and taxonomic considerations based on molecular and morphological evidence

A cladistic analysis of lucilia cass. (compositae, inuleae)