Background and Aims:

In Mexico, the subfamilies Tilioideae, Brownlowioideae and Grewioideae (Malvaceae) are represented by 11 genera, 75 species and one variety; 44 of these species and the variety are endemic to its territory. Their total distribution covers 28 states, highlighting the largest species diversity in the tropical areas of two states of the center-south-east of the country (the three first places correspond to Oaxaca, Chiapas and Guerrero). The objective of this work was to characterize the species present in the state of Guerrero, providing detailed information about the diversity, distribution and endemism. This knowledge leads to a better understanding of a group of little studied vascular plants in the country.

Methods:

We analyzed the information contained in regional studies published about floristics, taxonomy and vegetation, as well as that of the specimens collected in the entity, deposited in herbaria and available on the internet; for its completeness material was collected in the field. Based on all this, the final list was developed with the descriptions corresponding to the genera and species, and keys were prepared for the identification of these.

Key results:

The genera with the highest number of species are Triumfetta (19) and Corchorus (5). Dichotomous keys are provided for the identification of the genera and species recorded in the state, their description, synonymy, publication reference, ecological data and information of vouchers specimens, as well as their uses. Maps of geographical distribution in the state, as well as an illustration for each genus are included.

Conclusions:

We present a floristic-taxonomical review of seven genera and 32 species of the subfamilies Tilioideae and Grewioideae (Malvaceae) registered in Guerrero.

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