Keys for the Mexican tribes and genera of grasses (Poaceae)

Abstract

Background and Aims: The family Poaceae is one of the most diverse and important groups of angiosperms in Mexico and the world. Its taxonomy has changed considerably in the last years, due to studies that incorporate molecular evidence. The aim of this work is to provide updated keys for the tribes and genera of Poaceae that have been recorded in Mexico. Methods: For the elaboration of the list of genera and construction of the keys, literature and specimens of Poaceae were revised, both in physical and digital collections. The most recent classification proposal for the family was considered. To facilitate the use of the keys, photographs of some structures useful in the identification of the group were taken. Key results: For Mexico 30 tribes and 214 genera of Poaceae are recorded, of which two genera are endemic and 51 are represented only by introduced species. Eight genera previously recorded for Mexico were excluded, since their presence could not be verified. A key and description of each of the tribes are provided, as well as keys for their genera. Conclusions: This contribution is an important advance for the knowledge of Mexican grasses and is a useful tool for the researchers interested in this group. However, there is still much work to do to achieve an updated revision of the group in Mexico.