We studied the floral biology of 12 populations five rupicolous Pleurothallis (Orchidaceae) species occurring in campo rupestre vegetation at nine localities Brazil. All these are pollinated by flies belonging to families Chloropidae and Phoridae. In studied, all conspecific attracted same pollinator species. pollinators were females; they laid eggs flowers two nectarless species, but never nectar-presenting The pairs with similar flower morphologies odours pollinators: P. johannensis -...

Intra- and interspecific experimental pollinations were made to determine the mating systems crossing potential in individuals from 24 populations of five Pleurothallis species. johannensis , P. ochreata teres show weak or partial self-incompatibility while adamantinensis P.fabiobarrosii are more strictly self-incompatible. We found no differences fruit set between intra- interpopulation intraspecific crosses, there was correlation genetic variability inbreeding these All species...

Minasia ramosa, a new species from Brazil, is here described and illustrated. The endemic to the campos rupestres of Serra do Cabral, western extension Espinhaco Range in Minas Gerais. ramosa characterized by its narrow ensiform leaves, paniculate inflorescence totally setuliferous cypselae. affinities this are discussed.

Abstract The subtribe Lychnophorinae (Asteraceae: Vernonieae) comprises approximately 100 species and 18 genera distributed mostly in the Cerrado Domain of Brazilian Central Plateau. Phylogenetic analyses based on four molecular regions (ETS, ITS, ndhF, rpl32-trnL) a morphological dataset were performed, aiming to delimit monophyletic genera, confirm or refute generic assignment several species, achieve better understanding relationships between identify characters synapomorphies for major...

Uma listagem das espécies da família Asteraceae foi realizada no Parque Nacional Serra Canastra, situado sudoeste do estado de Minas Gerais, entre fevereiro 1994 a janeiro 1998. Os exemplares coletados encontram-se depositados herbário Universidade Federal Uberlândia, Gerais (HUFU). Na é mais diversa em número com um total 215 espécies, pertencentes 66 gêneros e 11 tribos. As 27 novas que foram descobertas pertencem anteriormente monotípicos ou poucas tais como Xerxes, Hololepis,...

We conducted an isozyme study in 22 populations of five Pleurothallis (Orchidaceae) species (12 loci nine enzymatic systems). The genetic variability all is surprisingly high ( P = 58–83%, A 2.1–3.8, H e 0.25–0.43) spite the fact that are pollinated by small flies whose behavior enables self‐pollination. suggest self‐incompatibility, inbreeding depression, and mechanical barriers prevent self‐pollination these responsible for maintainance variability. These traits uncommon Orchidaceae, but...

Morphometric analyses of vegetative and floral characters were conducted in 21 populations five Pleurothallis (Orchidaceae) species occurring Brazilian 'campo rupestre' vegetation. A phylogenetic analysis this group was also carried out using nuclear ribosomal DNA internal transcribed spacers (ITS1 ITS2). Results the ordination cluster agree with species' delimitation revealed by taxonomic allozyme studies. The groups formed correspond to pollinator determined a previous pollination study....

Foi investigada a fenologia e os visitantes florais de espécies da família Bromeliaceae em uma área Mata Atlântica, no Parque Estadual Intervales, Sudeste brasileiro. Os táxons estudados pertencem aos gêneros Tillandsia L. (3 spp.), Vriesea Lindl. (5 Aechmea Ruiz & Pav. Billbergia Thunb. (1 sp.) Nidularium Lem. (2 spp.). Foram estabelecidas transecções amostrais áreas com diferentes estádios sucessionais, onde foi registrada localização dos indivíduos nos estratos vegetação realizados censos...

Studies about reproductive biology of weed species can have implications on the establishment controlling practices that minimize effects these populations agricultural fields. The pollination Bidens alba (L.) DC., B. pilosa L., and subalternans was studied at different sites climatic seasons. are widely distributed in areas, disturbed habitats, along road sides. occur only coast. three self-compatible non agamospermous. composition pollinator community changes during year between sites....

Este trabalho trata das espécies de Miconia coletadas no Estado São Paulo. As 53 aqui relacionadas, descritas e comentadas representam, provavelmente, todos os táxons do gênero até o momento coletados neste Estado.

A new classification of the subtribe Lychnophorinae is proposed based on results phylogenetic analyses. The subtribes Centratherinae and Sipolisiinae are synonyms three genera (Albertinia, Blanchetia, Gorceixia) transferred to subtribe. As now circumscribed, comprises 19 117 species distributed mostly in Cerrado domain Brazilian Central Plateau. Oiospermum synonymized under Centratherum, Irwinia Blanchetia. Because Lychnophora as currently circumscribed paraphyletic, genus dismantled into...

In this taxonomic revision of Ceiba Mill, (in which we include Chorisia Kunth) recognize 17 species, seven group in the C. insignis. species aggregate. One new is described, lupuna P.E. Gibbs & Semir from Peru, referred to insignis agg., and one subspecies, aesculifolia subsp. parvifolia (Rose) recognized. Distribution maps are provided for 16 (that pentandra restricted New World), six illustrated.

Although breeding system investigations were previously performed in only nine of the 100 Tabebuia species, indications self‐incompatibility have been found all them, and four species studied for site incompatibility reaction showed some kind late‐acting self‐incompatibility. Polyembryony has T. chrysotricha ochracea, with adventitious origin extra embryos being shown latter. We investigated five by hand‐pollination experiments, fluorescence microscopy study situ pollen tube growth,...

A study was conducted in a riparian forest (Rio Paraguai, Brazil) to verify the vegetation mortality after an exceptional flooding 1995. Individuals with diameter at breast height > 5 cm were sampled 108 (10×10m) plots 1994, and re-sampled 1996. The total rate 4.1% per year. increased increasing of topographic positions, community level, suggesting that places where is less frequent are more affected by extreme floods.

Abstract The genus Calibrachoa (Solanaceae) comprises approximately 27 species that are found in open areas of southern South America, with the exception C. parviflora , which also occurs North America and Europe, probably as a result introduction from subsequent naturalization. is closely related to Petunia but differs characteristics such chromosome number, corolla aestivation, seed morphology, leaf anatomy. Previous publications have shown pygmaea morphological, ecological, molecular...