Anatomy And Essential Oils From Aerial Organs In Three Species Of Aldama (asteraceaeheliantheae) That Have A Difficult Delimitation

Recently, molecular analysis caused the South American Viguiera Kunth species to be transferred to Aldama La Llave. However, the circumscription has not been established for certain of the South American species, including Aldama filifolia (Sch.Bip. ex Baker) E.E.Schill. Panero, A. linearifolia (Chodat) E.E.Schill. Panero and A. trichophylla (Duśn) Magenta (comb. nov.), which had previously been treated as synonyms because of their high similarity. Therefore, the present study aimed to evaluate the anatomy of the aerial organs, and the yield and chemical composition of the essential oils from these three species, to determine the differences among them and thereby assist in species distinction. The anatomical analysis identified characteristics unique to each species, which are primarily related to the position and occurrence of secretory structures. Histochemical analysis demonstrated that the glandular trichomes and the canals secrete lipophilic substances, which are characterised by the presence of essential oils. The analysis of these essential oils identified monoterpenes as their major constituent and allowed for the recognition of chemical markers for each species. 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Novos registros de espécies da subtribo Ecliptinae (Heliantheae - Asteraceae) para a Amazônia brasileira New records of species of the Ecliptinae subtribe (Heliantheae - Asteraceae) to the Brazilian Amazon

Sete espécies da subtribo Ecliptinae encontradas nos estados do Acre, Amapá, Amazonas, Pará e Rondônia, são apresentadas como novos registros para a Amazônia brasileira: Acmella uliginosa, Aspilia camporum, Aspilia ulei, Melanthera latifolia, Melanthera nivea, Spilanthes nervosa e Wedelia calycina. São apresentadas descrições e ilustrações para as espécies, dados sobre a distribuição geográfica, hábitat, época de floração e frutificação. Os novos registros evidenciam a importância de estudos sobre a flora amazônica e demonstram a necessidade de coletas mais intensas na região.<br>The following seven species of the subtribe Ecliptinae found in the states of Acre, Amapá, Amazonas, Pará and Rondônia have been recorded at the Brazilian Amazonia, for the first time: Acmella uliginosa, Aspilia camporum, Aspilia ulei, Melanthera latifolia, Melanthera nivea, Spilanthes nervosa and Wedelia calycina. Species descriptions and illustrations are presented, as well as information about geographic distribution, habitats and phenology. These new records highlight the importance of the floristic studies in Amazonia, and the need to carry out intensive fieldwork to improve the sampling in this region

Reproductive biology in species of Bidens L. (Asteraceae) Biologia reprodutiva em espécies de Bidens L. (Asteraceae)

Studies about reproductive biology of weed species can have implications on the establishment of controlling practices that minimize the effects of these weed populations on agricultural fields. The pollination biology of Bidens alba (L.) DC., B. pilosa L., and Bidens subalternans DC., was studied at different sites and climatic seasons. Bidens pilosa and B. subalternans are widely distributed in agricultural areas, in disturbed habitats, and along road sides. Bidens alba occur only along the coast. The three species are self-compatible and non agamospermous. The composition of the pollinator community changes during the year and between sites. Hymenopterans and lepidopterans are the most frequent visitors to Bidens species in both areas studied. Although the species are self-compatible, the presence of pollinators may affect the levels of inbreeding. The attraction of insects by Bidens species may be benefical to agricultural crop and may also have important implications for conservation biology.<br>Estudos de biologia reprodutiva de espécies invasoras podem ter implicações sobre o estabelecimento de práticas de controle que minimizem o efeito das populações destas espécies em áreas agrícolas. A biologia da polinização de Bidens alba (L.) DC., B. pilosa L. e Bidens subalternans DC. foi estudada em diferentes locais e estações climáticas. Bidens pilosa e B. subalternans são espécies amplamente distribuídas em áreas agrícolas, em habitats perturbados e em margens de estradas. Bidens alba ocorre somente em regiões litorâneas. As três espécies são auto-compatíveis e não são agamospérmicas. A composição da comunidade de polinizadores apresenta diferenças durante o ano e entre locais. Himenópteros e lepidópteros são os visitantes mais freqüentes nas espécies de Bidens. Embora as espécies sejam auto compatíveis, a presença de polinizadores pode afetar os níveis de endocruzamento. A atração de insetos por espécies de Bidens pode beneficiar as culturas agrícolas e apresentar importantes implicações para a biologia da conservação