“El fin de un enigma”, una nueva subtribu y novedades nomenclaturales en Asclepiadeae (Apocynaceae: Asclepiadoideae)

Se propone Topea H. A. Keller como nuevo nombre para el género Aenigma H. A. Keller (Apocynaceae) por prexistir un homónimo fonético. Además, sobre la base de estudios de filogenia molecular se describe dentro de la tribu Asclepiadeae a la nueva subtribu monogenérica Topeinae H. A. Keller & Liede, endémica del Cono Sur de América del SurA new name, Topea H. A. Keller, is proposed for the genus Aenigma H. A. Keller (Apocynaceae) because there is a preexisting phonetic homonym. In addition, based on molecular phylogenetic studies, the new, monogeneric subtribe Topeinae H. A. Keller & Liede, endemic to the southern cone of South America, is here described within the tribe Asclepiadeae.Fil: Keller, Hector Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; Argentina. University of Bayreuth; AlemaniaFil: Liede Schumann, Sigrid. University of Bayreuth; Alemani

“El fin de un enigma”, una nueva subtribu y novedades nomenclaturales en Asclepiadeae (Apocynaceae: Asclepiadoideae)

A new name, Topea H. A. Keller, is proposed for the genus Aenigma H. A. Keller (Apocynaceae) because there is a preexisting phonetic homonym. In addition, based on molecular phylogenetic studies, the new, monogeneric subtribe Topeinae H. A. Keller & Liede, endemic to the southern cone of South America, is here described within the tribe AsclepiadeaeSe propone Topea H. A. Keller como nuevo nombre para el género Aenigma H. A. Keller (Apocynaceae) por prexistir un homónimo fonético. Además, sobre la base de estudios de filogenia molecular se describe dentro de la tribu Asclepiadeae a la nueva subtribu monogenérica Topeinae H. A. Keller & Liede, endémica del Cono Sur de América del Su

Caa, un nuevo género sudamericano de Gonolobinae (Apocynaceae: Asclepiadeae: Asclepiadoideae)

The phylogenetic analysis of the subtribe Gonolobinae allowed to determine the position of Matelea balansae Morillo & Fontella, a taxon that was not related to the clade of the genus Matelea Aubl. sensu stricto, nor was grouped into other generic clades. This leads to the foundation of a new monotypic genus, Caa H. A. Keller & Liede. Morphological information, complementary to the original diagnosis of the species, is included.El análisis filogenético de la subtribu Gonolobinae permitió determinar la posición de Matelea balansae Morillo & Fontella, taxón que no resultó afín al clado del género Matelea Aubl. sensu stricto, ni tampoco se agrupó dentro de otros clados genéricos. Ello propicia la conformación de un nuevo género monotípico, Caa H.A. Keller & Liede. Se incluye información morfológica complementaria a la diagnosis original de la especie.Fil: Keller, Hector Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; ArgentinaFil: Liede Schumann, Sigrid. University of Bayreuth; Alemani

Novelties in Oxypetalum (Apocynaceae: Asclepiadoideae): a new species and revalidation of the name O. megapotamicum

Based on a specimen collected in Santa Catarina state, Brazil, the new species Oxypetalum kassneri is described and illustrated. Moreover, a molecular phylogenetic analysis allows to propose the revalidation of O. megapotamicum, a species currently placed in the genus Ditassa. The neotype of D. megapotamica and the lectotype of D. oxypetala are designated here.Fil: Keller, Hector Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; ArgentinaFil: Funez, Luis Adriano. Universidade Federal de Santa Catarina; BrasilFil: Liede-Schumann, Sigrid. University of Bayreuth; Alemani

Novelties in Oxypetalum (Apocynaceae: Asclepiadoideae): a new species and revalidation of the name O. megapotamicum

Este estudo foi realizado em parte no âmbito do projeto PELD BISC.Baseado em um espécime de herbário coletado no estado de Santa Catarina, Brasil, descrevemos e ilustramos uma nova espécie: Oxypetalum kassneri. Além disso, com base em análises filogenéticas moleculares, propomos a revalidação de O. megapotamicum, espécie atualmente circunscrita no gênero Ditassa. O neótipo de D. megapotamica e o lectótipo de D. oxypetala são designados aqui.Brazilian Program for Biodiversity Research (PPBio) Atlantic Forest Network [CNPq 457451/2012-9]; CNPq/Capes/FAPs/BC-Fundo Newton/PELD [number 15/2016]

Phylogenetic relationships in the southern African genus Drosanthemum (Ruschioideae, Aizoaceae)

Background. Drosanthemum, the only genus of the tribe Drosanthemeae, is widespread over the Greater Cape Floristic Region in southern Africa. With 114 recognized species, Drosanthemum together with the highly succulent and species-rich tribe Ruschieae constitute the 'core ruschioids' in Aizoaceae. Within Drosanthemum, nine subgenera have been described based on flower and fruit morphology. Their phylogenetic relationships, however, have not yet been investigated, hampering understanding of monophyletic entities and patterns of geographic distribution. Methods. Using chloroplast and nuclear DNA sequence data, we performed network- and tree-based phylogenetic analyses of 73 species of Drosanthemum with multiple accessions for widespread species. A well-curated, geo-referenced occurrence data set comprising the 134 genetically analysed and 863 further accessions was used to describe the distributional ranges of intrageneric lineages and the genus as a whole. Results. Phylogenetic inference supports nine clades within Drosanthemum, seven of which group in two major clades, while the remaining two show ambiguous affinities. The nine clades are generally congruent to previously described subgenera within Drosanthemum, with exceptions such as (pseudo-) cryptic species. In-depth analyses of sequence patterns in each gene region were used to reveal phylogenetic affinities inside the retrieved clades in more detail. We observe a complex distribution pattern including widespread, species-rich clades expanding into arid habitats of the interior (subgenera Drosanthemum p.p., Vespertina, Xamera) that are genetically and morphologically diverse. In contrast, less species-rich, genetically less divergent, and morphologically unique lineages are restricted to the central Cape region and more mesic conditions (Decidua, Necopina, Ossicula, Quastea, Quadrata, Speciosa). Our results suggest that the main lineages arose from an initial rapid radiation, with subsequent diversification in some clades.Raw data, code, analysis output, and species occurrence The zip file contains a ReadMe file and 4 folders: 1_main_data_and_results (the files used to produce the figures in the main text); 2_ML_phylogenetics (raw data, code, and analysis output of ML phylogenetic analyses); 3_MJ_networks (raw data [SNP/sequence motive recoded DNA alignment matrices], and output of median-joining network analyses)