On the identity of two Mexican species of Ageratina (Eupatorieae, Asteraceae): A. grandifolia and A. rivalis

Oscar Hinojosa-Espinosa, José Luis Villaseñor, Enrique Ortiz

Abstract


Background: Ageratina, with 167 species, constitutes the most diverse genus of the Mexican Asteraceae and the sixth most diverse of the vascular plants in Mexico. The taxonomy of the genus is complex, due to its number of species and the numerous inadequately delimited taxa or with intricate and confusing nomenclature. In addition, little known species have sometimes remained under the synonymy of another different species, as in the case of A. rivalis, which has been considered as a synonym of A. grandifolia.

Question: Is it possible to recognize Ageratina rivalis as a distinct species of A. grandifolia by critically analyzing its circumscription, nomenclature and geographical distribution?

Taxon: Ageratina grandifolia and A. rivalis.

Study site: Mexico.

Method: A thorough review of herbarium specimens, field material, descriptions and geographic distribution of the species was made to contrast them.

Results: Several differences exist in the morphology and geographical distribution of Ageratina rivalis and A. grandifolia. Descriptions, pictures, distribution maps, synonymy and a key to distinguish them from similar species are provided. The presence of A. grandifolia in Mexico City is also documented. Lectotypes are designated for Eupatorium conspicuum, E. conspicuum var. pueblense, E. grandifolium, and E. rivale.

Conclusions: Morphology and geography support the distinction between A. grandifolia and A. rivalis. However, further research is desirable to corroborate or refute this statement, and especially to clearly circumscribe several similar species that seem to be related. This work contributes to a better understanding of the taxonomy and biogeography of the genus Ageratina in Mexico.


Keywords


lectotype designation; invasive plants; medicinal plants; ornamental plants; taxonomy

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References


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DOI: http://dx.doi.org/10.17129/botsci.2143

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Botanical Sciences is an international peer-reviewed journal that publishes scientific papers in plant sciences. The arguments, figures / schemes / photographs, quality and the general contents of this publication are full responsibility of the authors, and not commit the Editor- in-Chief or the Sociedad Botánica de México.

Botanical Sciences year 8, Vol. 97, No. 1, January-March 2019. Quarterly publication edited and published by Sociedad Botánica de México A.C. (www.socbot.mx). Editor in Chief Salvador Arias, Jardín Botánico, Instituto de Biología, 3er Circuito s/n, Ciudad Universitaria, Delegación Coyoacán, C.P. 04510. Reserves of Rights to the Exclusive Use No. 04-2017-040716054100-203, digital-ISSN 2007-4476, both granted by the Instituto Nacional del Derecho de Autor. Responsible for updating the page Pedro López, email: plopez@escire.mx, eScire. Last update March 11, 2019.

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