Organización del capítulo fructífero y heterocarpia en Bidens pilosa L.
Marinis, G. de.
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Organization of fructiferous heads and heterocarpy of Bidens pilosa LOrganizacao do capítulo frutífero e heterocarpia em Bidens pilosa L.
Bidens pilosa L.. (Compositae) one among the World's worst weeds, produces open globose heads of desmochorous achenes disposed radially around the receptacle. These achenes are more numerous (about 60%) in the inferior hemisphere and their length decreases, while their width increases, along an apex — basis gradient. The achenes nearer to the basis (about 20%) are much shorter and differ from the others also in shape and in ornamentations. These brachycamous achenes remain connected to the receptacle longer than the other ones and showed a very low percentage of germination, in common laboratory conditions. B. pilosa, therefore, shows a certain degree of heterocarpy, perhaps associated with the process of dispersal and germina-tion of its achenes.
Instituto Interamericano de Cooperación para la Agricultura (IICA)
Is part of
Turrialba; Vol. 33, no. 2
URI (Permanet link to cite or share this item)https://repositorio.catie.ac.cr/handle/11554/12009
- Turrialba