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de Araujo A.O.,Federal University of ABC | Souza V.C.,University of Sao Paulo | Chautems A.,Conservatoire and Jardin Botaniques de la Ville de Geneva
Acta Botanica Brasilica | Year: 2012

Gloxinia L'Her. is a genus that has undergone major changes since the reorganization of the tribe Gloxinieae in the last few decades. We here designate 15 lectotypes, indicate six illegitimate superfluous names, and propose one new combination for this group; comments about three species with uncertain identities are also included.

de Araujo A.O.,University of Sao Paulo | Souza V.C.,University of Sao Paulo | Perret M.,Conservatoire and Jardin botaniques de la Ville de Geneva
Taxon | Year: 2010

A new species of Gesneriaceae discovered in remnants of deciduous forests on limestone outcrops in Minas Gerais, Brazil, is described and compared with morphologically related taxa. This plant presents the diagnostic features of the tribe Gloxinieae, but a unique combination of morphological traits distinguishes this taxon from previously described genera. Its phylogenetic position was inferred based on analyzing DNA sequences variation of five loci: the rpl16 intron, rps16 intron, trnL-F intron-spacer, a portion of the plastid-expressed glutamine synthetase gene (ncpGS) and the ribosomal DNA internal transcribed spacer (ITS). Molecular phylogenetic analyses confirm the position of this new species in the Gloxinieae, as a sister lineage of a clade including the Brazilian genera Mandirola and Goyazia. However, tests using topological constraints do not reject the alternative relationship that places this taxon with Gloxiniopsis in a monophyletic group. To accommodate this species in the current generic circumscription of Gloxinieae, the new genus Chautemsia A.O. Araujo & V.C. Souza is created.

Ranieri B.D.,Federal University of Minas Gerais | Pezzini F.F.,Federal University of Minas Gerais | Garcia Q.S.,Federal University of Minas Gerais | Chautems A.,Conservatoire and Jardin Botaniques de la Ville de Geneva | Franca M.G.C.,Federal University of Minas Gerais
Austral Ecology | Year: 2012

The germination requirements of sexually reproducing plants are regulated by environmental factors such as temperature. Those factors acting at the germination phase are part of the regeneration niche, which is fundamental in the processes that contribute to habitat suitability and geographic distribution. We tested the hypothesis that rarity is associated with regeneration niche in three species of plants in the family Gesneriaceae (tribe Sinningieae), Sinningia rupicola (Mart.) Wiehler, Paliavana sericiflora Benth and Sinningia allagophylla (Mart.) Wiehler, which vary in their distribution and habitat specificity but share a small zone of sympatry in rocky fields south of Belo Horizonte in Minas Gerais, Brazil. The regeneration niche was tested using a seed germination experiment under controlled light conditions at seven fixed temperatures (10-40°C at 5°C intervals). Each of the three species germinated differently at the various temperatures. The species with the smallest geographic range, S. rupicola, also had the most restricted germination: germination peaked at 15°C when relatively few seeds germinated (45%), and even fewer germinated at other temperatures. The regeneration niche was wider in P. sericiflora and wider still in S. allagophylla, with germination greater than 90% between 15-25°C and greater than 80% between 15-30°C, respectively. Our germination results provide qualified support for the hypothesis of correlation of the regeneration niche with geographic distribution of related plant taxa, with important conservation implications for rare and endangered species. © 2011 The Authors. Journal compilation © 2011 Ecological Society of Australia.

De Araujo A.O.,Federal University of ABC | Chautems A.,Conservatoire and Jardin Botaniques de la Ville de Geneva
Phytotaxa | Year: 2015

The new species Sinningia minima (Gesneriaceae) from Serra dos Carajás (Pará, Brazil) is described and illustrated. It is readily distinguished from its congeners by its minute size, being smaller in all vegetative and fertile organs than any other Sinningia species. It is also the first member of this genus registered for the Pará State. New floristic data and an identification key to the Gesneriaceae from the Serra do Carajás are also provided. © 2015 Magnolia Press.

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