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Silveira, Fernanda Schmidt [1], Miotto, Silvia T. Sfoggia [1].

A taxonomic headache due to a ‘Frankenstein type’: solving the identity and typification of a Mimosa species.

A nomenclatural type is the element to which a name is permanently attached and must consist of a gathering, or part of a gathering, of a single species or infraspecific taxon. However, sometimes more than one species may be mounted on a single herbarium sheet (admixture), causing a nomenclatural confusion (‘Frankenstein type’) in the use of a name, which creates a ‘taxonomic headache’. This is the case of the assigned holotype to Mimosa asperoides Izag. & Beyhaut, a species described in 2009 based only on herbarium material and considered endemic to Uruguay until then. We discovered the ‘Frankenstein type’ of this species by the recent collections in Brazil, through the revision of original material, annotations on the herbarium labels and by the analysis of the protologue. To confirm the identity of the species of Mimosa involved in the admixture, we comparatively analyzed 17 morphological characters among the presumable species in the admixture. This analysis allowed us to identify which of the fragments of the ‘Frankenstein type’ would correspond to M. asperoides, enabling the lectotypification of its name according to the rules of the International Nomenclature Code for algae, fungi and plants. In addition, we identified the other species in the admixture, which is Mimosa axillarioides Izag. & Beyhaut. We also highlighted other six new morphological features to help the diagnosis of M. asperoides besides the fruit, which has been previously indicated in the protologue. These features are the arrangement of the leaves on the secondary branches, the size and shape of the leaflets, the length and indumentum of the peduncles and the fruit indumentum. Finally, we extended the occurrence of Mimosa asperoides in South America, reporting its first citation for Brazil and discussed the role of taxonomy to solve this nomenclatural problem.

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1 - Universidade Federal do Rio Grande do Sul, Botany, Porto Alegre, Brazil

South America.

Presentation Type: Poster
Session: P3, Systematics Posters
Location: Virtual/Virtual
Date: Wednesday, July 21st, 2021
Time: 5:00 PM(EDT)
Number: P3SY011
Abstract ID:855
Candidate for Awards:None

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