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| Registros recuperados: 11 | |
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| Moon, H.-K.; Vinckier, S.; Walker, J.; Smets, E.F.; Huysmans, S.. |
| The pollen morphology and ultrastructure of the subtribe Salviinae were investigated with light, scanning electron, and transmission electron microscopy. In addition, cladistic analyses of the obtained morphological data, supplemented with rbcL data from GenBank, were conducted in order to assess the phylogenetic signal of palynological characters. Salviinae pollen is small to large, oblate to prolate in shape, with a circular to slightly elliptic amb, and mostly hexacolpate. Perovskia abrotanoides appears to be distylous and shows a significant pollen dimorphism between pin and thrum flowers. The sexine ornamentation of the genera Lepechinia and Chaunostoma is perforate, while the ornamentation of other genera is bireticulate. Perovskia expresses a unique... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Pollen morphology Salviinae sexine ornamentation symplesiomorphic condition improved resolution bootstrap support values molecular phylogenetic analyses ultrastructure 42.41; 42.58. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/449556 |
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| Flores Olvera, H.; Smets, E.F.; Vrijdaghs, A.. |
| Background and Aims In spite of recent phylogenetic analyses for the Chenopodiaceae–Amaranthaceae complex, some morphological characters are not unambiguously interpreted, which raises homology questions. Therefore, ontogenetic investigations, emphasizing on ‘bracteoles’ in Atripliceae and flowers in Chenopodioideae, were conducted. This first paper presents original ontogenetic observations in Beta vulgaris, which was chosen as a reference species for further comparative investigation because of its unclarified phylogenetic position and its flowers with a (semi-)inferior ovary, whereas all other Chenopodiaceae–Amaranthaceae have hypogynous flowers. Methods Inflorescences and flowers were examined using scanning electron microscopy and light microscopy.... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Beta vulgaris Cheonopodiaceae floral ontogeny gynoecial development epigynous hypanthium semi-inferior ovary inflorescence ontogeny LM SEM 42.41; 42.48; 42.58. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/449533 |
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| Jacobs, B.; Donoghue, M.J.; Bouman, F.; Huysmans, S.; Smets, E.F.. |
| Recent phylogenetic analyses based on molecular markers have resulted in a solid phylogeny of Viburnum with 12 well-defined clades. This has allowed us to focus on character evolution, endocarp and seed characters in particular. Members of Viburnum bear drupes that differ considerably between clades. Characters such as pyrene shape and grooving, number of fibrous layers, seed coat anatomy, and seed rumination are phylogenetically highly valuable. Our results largely agree with the results based on molecular data and provide several additional insights. The position of V. clemensae as sister to the rest of Viburnum is supported by several characters. The early diversification of V. clemensae might explain its highly derived features. Furthermore, our... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Viburnum Adoxaceae endocarp seed evolution phylogeny 42.43; 42.58. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/449561 |
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| Moon, H.-K.; Vinckier, S.; Smets, E.F.; Huysmans, S.. |
| This study provides new pollen data of 52 representative species belonging to all 12 genera in the currently classification of the subtribe Nepetinae, and considers the possible presence of orbicules for the first time. Pollenmorphology and ultrastructure were investigated with light, scanning electron and transmission electron microscopy. Nepetinaepollen is small to large (P = 16–65 µm, E = 17–53 µm), oblate to prolate (P/E = 0.7–1.6) in shape and mostly hexacolpate (sometimes octocolpate). The exine stratification in all taxa studied is similar and characterized by unbranched columellae and a continuous, granular endexine. Sexine ornamentation in the Nepetinae is bireticulate, microreticulate or perforate. In perforate and microreticulate pattern a... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Nepetoidea orbicules palynology Nepetinae sexine ornamentation ultrastructure 42.41; 42.48; 42.58. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/449553 |
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| Ruchisansakun, S.; Suksathan, P.; Niet, T. van der; Smets, E.F.; Saw-Lwin; Janssens, S.B.. |
| A revision of the Balsaminaceae of Myanmar is presented based on herbarium collections and a field trip in 2015. Sixty-five species, unevenly distributed across one monotypic (Hydrocera) and one species-rich genus (Impatiens), are recognised. An identification key to species is presented. Twenty species are new records for the country, 17 names are typified and seven species names are synonymized. For each species, a description of the morphology, phenology, ecology and distribution range is provided. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Hydrocera; Impatiens; Southeast Asia; Taxonomy. |
| Ano: 2018 |
URL: http://www.repository.naturalis.nl/record/671470 |
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| Merckx, V.; Chatrou, L.W.; Lemaire, B.; Sainge, M.N.; Huysman, S.; Smets, E.F.. |
| Background: Myco-heterotrophy evolved independently several times during angiosperm evolution. Although many species of myco-heterotrophic plants are highly endemic and longdistance dispersal seems unlikely, some genera are widely dispersed and have pantropical distributions, often with large disjunctions. Traditionally this has been interpreted as evidence for an old age of these taxa. However, due to their scarcity and highly reduced plastid genomes our understanding about the evolutionary histories of the angiosperm myco-heterotrophic groups is poor. Results: We provide a hypothesis for the diversification of the myco-heterotrophic family Burmanniaceae. Phylogenetic inference, combined with biogeographical analyses, molecular divergence time estimates,... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Myco-heterotrophy angiosperm evolution pantropical distribution reduced plastid genomes evolutionary history Burmanniaceae West Gondwana diversification boreotropical migration Eocene 42.44; 42.48; 42.57. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/449529 |
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| Merckx, V.; Schols, P.; Geuten, K.; Huysmans, S.; Smets, E.F.. |
| Amolecular phylogenetic analysis of Nartheciaceae is presented, with nine species of the family’s five genera. The main phylogenetic findings are: (a) Nietneria and Narthecium are placed in a clade sister to Lophiola; (b) sister to the Lophiola-Narthecium- Nietneria clade is a clade formed by Aletris and the monospecific Metanarthecium; (c) the inclusion of Metanarthecium luteo-viride in Aletris, as proposed by several authors, is well supported. The pollen and orbicule morphology of representatives of five genera is described. The results underline a close relationship between Nietneria, Narthecium, and Lophiola and confirm the previously reported observations of Metanarthecium pollen and the types of sexine ornamentation in Aletris. Pollen grains of... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Dioscoreales Nartheciaceae Nietneria molecular phylogeny orbicules pollen morphology 42.43; 42.48; 42.57. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/449539 |
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| Registros recuperados: 11 | |
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