Fruit of lepidaploa (cass.) cass. (vernonieae, asteraceae): anatomy and taxonomic implications
Fecha
2018-10Autor
Marques, Danilo
Oliveira Franca, Rafael de
Dematteis, Massimiliano
Marzinek, Juliana
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Lepidaploa is a taxonomically complex genus of Vernonieae, which is difficult to delimit morphologically due to
vegetative and reproductive characters that overlap with Chrysolaena and Lessingianthus. Anatomical studies of
cypselae are taxonomically useful for delimiting subtribes, genera and species of Asteraceae, and especially within
Astereae and Eupatorieae. Given the importance of cypselae to the taxonomy of tribes of Asteraceae, we searched
for morphological patterns among the species of Lepidaploa. Using light microscopy, we analyzed fruits of 21 species
of Lepidaploa to evaluate the taxonomic position of the genus and species of questionable placement in the group.
Our results showed that the morphologies of the cypselae of species of Lepidaploa are homogeneous and similar to
other species of Vernonieae. However, pappus vascularization and the number of mesocarp layers could be useful
for differentiating the sister groups Chrysolaena, Lepidaploa and Lessingianthus, which present similar macro- and
micro-morphological, palynological and chromosomal characters. Also, the presence of glandular trichomes and
idioblasts in the cypsela, and lignified cells in the carpopodium exocarp, can be used to separate closely related species.
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