Chemical composition of the scent from living flowers of Temnadenia odorifera (Vell.) J. F. Morales (Apocynaceae).

IFF. P5-S3. 8 a 12 de maio

Voluntary Disclosure Programs for Tax Evaders

In this paper, we develop a model that can explain why governments may want to choose to offer a voluntary disclosure program that allows people who withheld taxes to turn themselves in without punishment. We find that such a leniency rule not only increases government revenue when it comes as a surprise, but even when taxpayers anticipate it

The diversity and evolution of pollination systems in large plant clades: Apocynaceae as a case study

Background and Aims Large clades of angiosperms are often characterized by diverse interactions with pollinators, but how these pollination systems are structured phylogenetically and biogeographically is still uncertain for most families. Apocynaceae is a clade of >5300 species with a worldwide distribution. A database representing >10 % of species in the family was used to explore the diversity of pollinators and evolutionary shifts in pollination systems across major clades and regions. Methods The database was compiled from published and unpublished reports. Plants were categorized into broad pollination systems and then subdivided to include bimodal systems. These were mapped against the five major divisions of the family, and against the smaller clades. Finally, pollination systems were mapped onto a phylogenetic reconstruction that included those species for which sequence data are available, and transition rates between pollination systems were calculated. Key Results Most Apocynaceae are insect pollinated with few records of bird pollination. Almost three-quarters of species are pollinated by a single higher taxon (e.g. flies or moths); 7 % have bimodal pollination systems, whilst the remaining approx. 20 % are insect generalists. The less phenotypically specialized flowers of the Rauvolfioids are pollinated by a more restricted set of pollinators than are more complex flowers within the Apocynoids + Periplocoideae + Secamonoideae + Asclepiadoideae (APSA) clade. Certain combinations of bimodal pollination systems are more common than others. Some pollination systems are missing from particular regions, whilst others are over-represented. Conclusions Within Apocynaceae, interactions with pollinators are highly structured both phylogenetically and biogeographically. Variation in transition rates between pollination systems suggest constraints on their evolution, whereas regional differences point to environmental effects such as filtering of certain pollinators from habitats. This is the most extensive analysis of its type so far attempted and gives important insights into the diversity and evolution of pollination systems in large clades

New combinations and a new species in the Brazilian genus Chaetostoma DC. (Microlicieae: Melastomataceae)

Volume: 9Start Page: 202End Page: 20

New Combinations And A New Species In The Brazilian Genus Chaetostoma Dc. (microlicieae: Melastomataceae)

Four new combinations in Chaetostoma (C. albiflorum, C. cupressinum, C. selagineum, C. stenocladon,) are proposed, and a new species, Chaetostoma flavum, endemic to the Chapada dos Veadeiros, Goias, Brazil, is described. The new species can be distinguished by its 4-5-locular ovary and antisepalous stamens with prolonged appendages.92202204Cogniaux, A., Melastomaceae (1883) Flora Brasiliensis, 14 (3), pp. 1-510. , C. F. P. von Martius & A. G. Eichler (editors)Melastomaceae (1891) Monographiae Phanerogamarum, 7, pp. 1-1256. , A. DeCandolle & C. DeCandolle (editors)Koschnitzke, C., (1997) Revisão Taxonômica do Gênero Chaetostoma DC. (Microlicieae: Melastomataceae), , Ph.D. Thesis, Universidade Estadual de Campinas, São Paul

(1586) Proposal To Conserve The Name Chaetostoma Pungens Against Rhexia Armata (melastomataceae, Microlicieae)

[No abstract available]52236636