Pollen morphology of the South American genus Lessingianthus (Vernonieae, Asteraceae) and its taxonomic implications
Open Access
- 17 March 2010
- journal article
- research article
- Published by Informa UK Limited in Grana
- Vol. 49 (1), 12-25
- https://doi.org/10.1080/00173130903435192
Abstract
The pollen grains of 111 species of Lessingianthus were analysed. Almost all the species belong to the type “B” pollen, characteristic of the genus. These grains are oblate-spheroidal, spheroidal to prolate-spheroidal (P/E 0.93–1.04), echinolophate, 3-colporate, with lacunae in a regular pattern, without polar lacunae. However, some species show variations of this basic type. The type “B-1”, “B-2” and “B-3” grains are respectively 3-porate lacking equatorial lacunae, 3-porate with equatorial lacunae and 3-colporate, psilolophate. Also, one species showed type “D” pollen, a palynomorph present in other genera of the tribe but not reported until now for Lessingianthus. The analysis confirms that the species of the genus constitute well-defined groups based on the pollen characteristics. The results ascertain that pollen morphology is a significant feature in the identification and delimitation of species and genera of Vernonieae.Keywords
This publication has 16 references indexed in Scilit:
- Caryological analysis of South American species ofVernonia(Vernonieae, Asteraceae)Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology, 2009
- Pollen morphology of some species ofVernonia s. l.(Vernonieae, Asteraceae) from Argentina and ParaguayGrana, 2008
- Glossary of pollen and spore terminologyReview of Palaeobotany and Palynology, 2006
- Two new species of Lessingianthus (Vernonieae, Asteraceae) from the Brazilian highlandsBotanical Journal of the Linnean Society, 2006
- Cytotaxonomic analysis of South American species of Vernonia (Vernonieae: Asteraceae)Botanical Journal of the Linnean Society, 2002
- Chromosome studies on nine South American species ofVernonia(Vernonieae, Asteraceae)Caryologia, 2000
- Pollen morphology and classification of theVernonieae(Compositae)Acta Botanica Gallica, 1994
- Mesanthophora, a New Genus of Vernonieae (Asteraceae) from ParaguayNovon: A Journal for Botanical Nomenclature, 1992
- Distribution of Pollen Types in Vernonia (Vernonieae: Compositae)Systematic Botany, 1979
- Taxonomic Implications of External Pollen Morphology to Vernonia (Compositae) in the West IndiesAmerican Journal of Botany, 1977