São Paulo, Brazil
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Carneiro-Torres D.S.,State University of Feira de Santana | Cordeiro I.,Institute Botnica | Giulietti A.M.,State University of Feira de Santana | Riina R.,University of Michigan
Systematic Botany | Year: 2012

Euphorbia flaviana, a new species endemic to the State of Bahia in eastern Brazil, is described and illustrated. The new species belongs to Euphorbia [subgenus Chamaesyce] section Crossadenia and is morphologically most similar to Euphorbia teres, from which it differs in having thinner, longer, numerous verticillate branches, and involucral glands without appendages. An artificial key to all nine members of Euphorbia section Crossadenia is provided, and Euphorbia crossadenia is lectotypified. © Copyright 2012 by the American Society of Plant Taxonomists.

Oliveira V.F.,Institute Botnica | Zaidan L.B.P.,Institute Botnica | Braga M.R.,Institute Botnica | Aidar M.P.M.,Institute Botnica | Carvalho M.A.M.,Institute Botnica
Functional Plant Biology | Year: 2010

Carbon allocation in biomass is an important response of plants to the increasing atmospheric [CO2]. The effects of elevated [CO 2] are scarcely reported in fructan-accumulating plants and even less in tropical wild species storing this type of carbohydrate. In the present study, the effects of high [CO2] atmosphere was evaluated on growth, biomass allocation and fructan metabolism in Vernonia herbacea (Vell.) Rusby, an Asteraceae from the Brazilian cerrado, which accumulates inulin-type fructans in the underground organs (rhizophores). Plants were cultivated for 120 days in open-top chambers (OTCs) under ambient (∼380molmol-1), and elevated (∼760molmol-1) [CO2]. Plant growth, photosynthesis, fructan contents, and the activities of fructan metabolising enzymes were analysed in the rhizophores at Time 0 and 15, 30, 60, 90 and 120 days. Plants under elevated [CO2] presented increases in height (40%), photosynthesis (63%) and biomass of aerial (32%) and underground (47%) organs when compared with control plants. Under elevated [CO2] plants also presented higher 1-SST, 1-FFT and invertase activities and lower 1-FEH activity. Although fructan concentration remained unchanged, fructan productivity was higher in plants maintained under elevated [CO2], due to their higher rhizophore biomass. This is the first report on the effects of elevated [CO2] on a plant species bearing underground organs that accumulate fructans. Our results indicate that plants of V. herbacea can benefit from elevated atmospheric [CO2] by increasing growth and carbon allocation for the production of inulin, and may contribute to predict a future scenario for the impact of this atmospheric condition on the herbaceous vegetation of the cerrado. © CSIRO 2010.

Santos-Gonalves A.P.,Federal University of Minas Gerais | Carvalho-Okano R.M.D.,Federal University of Minas Gerais | Filgueiras T.S.,Institute Botnica
Systematic Botany | Year: 2012

Abstract A new species of woody bamboo (Poaceae: Bambusoideae), from Rio Doce State Park, Minas Gerais, Brazil, Merostachys tatianae is here described and illustrated. In its vegetative state the new species can be distinguished from all the known species in the genus by the longest internodes so far recorded for the genus (37108 cm long) as well as by the huge culm-leaves (3863.5 cm long). Both, the internodes and the culm-leaves are hispid, covered by irritating trichomes. © Copyright 2012 by the American Society of Plant Taxonomists.

Bueno N.C.,University Estadual Do Oeste Do Paran | Prado J.F.,Federal University of Rio Grande do Sul | Meurer T.,University Estadual Do Oeste Do Paran | Bicudo C.E.D.M.,Institute Botnica
Systematic Botany | Year: 2011

Twelve taxa of the genus Chara (Characeae, Chlorophyta) are decribed and illustrated based on specimens from southern Brazil. The taxonomic survey in the states of Paran, Santa Catarina and Rio Grande do Sul recorded seven, one, and nine species for each state, respectively. Chara guairensis was the most common species in the area, followed by C. rusbyana. The species Chara guairensis, C. martiana, C. rusbyana, Chara hydropitys, C. braunii and its varieties were recorded for the first time in Rio Grande do Sul, and the following six for Paran: C. angolensis, C. diaphana, C. guairensis, C. kenoyeri, C. martiana, and C. zeylanica. © 2011 by the American Society of Plant Taxonomists.

Indriunas A.,Institute Botnica | Kameyama C.,Institute Botnica
Systematic Botany | Year: 2012

During a taxonomic review of the Neotropical genus Herpetacanthus (Acanthaceae) we found eight new species from the Atlantic Forest and one from a neighboring deciduous forest in Brazil: H. angustatus, H. chalarostachyus, H. delicatus, H. longipetiolatus, H. neesianus, H. parvispica, H. pauciflorus, H. strongyloides, and H. magnobracteolatus, which are here described and illustrated. Geographical distribution for each species is provided, as well as a key to all Atlantic forest species of Herpetacanthus. © Copyright 2012 by the American Society of Plant Taxonomists.

Versieux L.M.,Federal University of Rio Grande do Norte | Vasconcellos N.,Jardim Botnico Do Rio de Janeiro | Martinelli G.,Jardim Botnico Do Rio de Janeiro | Das Graas Lapa Wanderley M.,Institute Botnica
Systematic Botany | Year: 2012

Alcantarea pataxoana is described and illustrated. The new species is compared to Alcantarea burle-marxii, which we assume is the most morphologically similar species, as well as to A. nahoumii. The new species is the second taxon of this genus recorded for the flora of the state of Bahia, northeastern Brazil, and its differences from A. nahoumii are highlighted in an updated taxonomic key for that state. © Copyright 2012 by the American Society of Plant Taxonomists.

Luz C.F.P.D.,Institute Botnica | Fernandes-Salomao T.M.,University Federal Of Viosa | Lage L.G.A.,University Federal Of Viosa | Resende H.C.,University Federal Of Viosa | And 2 more authors.
Psyche | Year: 2011

Pollen samples were collected in three different periods from 11 Melipona capixaba Moure & Camargo hives and analyzed with melissopalynological methodology. A total of 33 pollen types were identified, of which 23 genera and 15 families were identified. The following families showed the highest pollen richness: Fabaceae (7), Myrtaceae (3), Solanaceae (3), Arecaceae (2), Asteraceae (2), Euphorbiaceae (2), Melastomataceae/Combretaceae (2), Rubiaceae (2), and Sapindaceae (2). The most frequent pollen types (45) were Eucalyptus, which generated great similarities between the samples, except one in which the Tibouchina was predominant. Although the majority of the pollen types showed low percentage values, the results demonstrated that M. capixaba has taken advantage of the polliniferous sources available in the Atlantic Rainforest as well as in the Capoeira (brushwood, secondary forest) and ruderal (field) plants, probably implying its importance as a pollinator of the native flora and of the exotic species. Copyright 2011 Cynthia Fernandes Pinto da Luz et al.

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