Structure and ontogeny of the pericarp of six Eupatorieae (Asteraceae) with ecological and taxonomic considerations
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Academia Brasileira de Ciências
2010
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| _version_ | 1876439555305897984 |
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| author | Juliana Marzinek |
| author_facet | Juliana Marzinek |
| contents | Structure and ontogeny of the pericarp of six Eupatorieae (Asteraceae) with ecological and taxonomic considerations Juliana Marzinek Denise M.T. Oliveira Multidisciplinaria (Ciencias Naturales y Exactas) fruit pappus Anatomy Asteraceae carpopodium The ontogeny of cypselae and their accessory parts were examined using light and scanning electron microscopy for the species Campuloclinium macrocephalum, Chromolaena stachyophylla, Mikania micrantha, Praxelis pauciflora, Symphyopappus reticulatus, and Vittetia orbiculata, some of these being segregated from the genus Eupatorium. A layer of phytomelanin observed in the fruit appears to be secreted by the outer mesocarp into the schizogenous spaces between the outer and inner mesocarp; its thickness was observed to vary among the different species examined. The bristles of the pappus are vascularized, except in M micrantha, and have cells that are superficially projected and arranged acropetally; in S. reticulatus some of the projections are retrorse and a fracture line on the floral disk that is only seen in this species may indicate a double dispersal process. Numerous differences observed among the cypselae examined here reinforce earlier segregations of the genus Eupatorium sensu lato. 2010 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32713482004 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.2 Vol.82 |
| format | Artículo científico |
| id | redalyc_32713482004 |
| institution | Redalyc |
| language | en |
| publishDate | 2010 |
| publisher | Academia Brasileira de Ciências |
| spellingShingle | Structure and ontogeny of the pericarp of six Eupatorieae (Asteraceae) with ecological and taxonomic considerations Juliana Marzinek Multidisciplinaria (Ciencias Naturales y Exactas) fruit pappus Anatomy Asteraceae carpopodium Structure and ontogeny of the pericarp of six Eupatorieae (Asteraceae) with ecological and taxonomic considerations Juliana Marzinek Denise M.T. Oliveira Multidisciplinaria (Ciencias Naturales y Exactas) fruit pappus Anatomy Asteraceae carpopodium The ontogeny of cypselae and their accessory parts were examined using light and scanning electron microscopy for the species Campuloclinium macrocephalum, Chromolaena stachyophylla, Mikania micrantha, Praxelis pauciflora, Symphyopappus reticulatus, and Vittetia orbiculata, some of these being segregated from the genus Eupatorium. A layer of phytomelanin observed in the fruit appears to be secreted by the outer mesocarp into the schizogenous spaces between the outer and inner mesocarp; its thickness was observed to vary among the different species examined. The bristles of the pappus are vascularized, except in M micrantha, and have cells that are superficially projected and arranged acropetally; in S. reticulatus some of the projections are retrorse and a fracture line on the floral disk that is only seen in this species may indicate a double dispersal process. Numerous differences observed among the cypselae examined here reinforce earlier segregations of the genus Eupatorium sensu lato. 2010 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32713482004 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.2 Vol.82 |
| title | Structure and ontogeny of the pericarp of six Eupatorieae (Asteraceae) with ecological and taxonomic considerations |
| topic | Multidisciplinaria (Ciencias Naturales y Exactas) fruit pappus Anatomy Asteraceae carpopodium |
| url | https://www.redalyc.org/articulo.oa?id=32713482004 |