Background:

The genus Bartlettina (Eupatorieae, Asteraceae) is a group of neotropical plants. Mexico is the country with the greatest richness; 22 taxa are known, of which 13 are endemic to the country. Due to their specific habitat requirements, they are more susceptible to anthropogenic disturbances and therefore to extinction. Thus, research efforts focused on these groups are a priority.

Questions:

What is the distribution of the endemic species of the genus Bartlettina in Mexico?, where are their main richness areas?, what is their conservation status?

Studied species:

Species of Bartlettina endemic to Mexico.

Study site and dates:

Mexico, January 2022 to February 2024.

Methods:

A revision of all available herbarium specimens was carried out. Taxonomic, geographic and ecological information was obtained. Distribution maps were prepared and the areas with the greatest richness were identified. The conservation status was evaluated according to criterion B of the International Union for Conservation of Nature.

Results:

The species studied are distributed mainly in the humid montane, Pinus-Quercus and Quercus forests. The Sierra Norte de Oaxaca, the Sierra Madre Oriental-Faja Volcánica Transmexicana transition zone and the Sierra Madre Oriental are the regions with the highest richness. Six species were identified as Endangered, one as Vulnerable, two as Near Threatened and four as Data Deficient.

Conclusions:

Most of the species in the group studied have restricted distribution and habitat specificity, being found in highly threatened vegetation types and therefore require protection measures.

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