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vol.99 issue4Ovule development, megasporogenesis, and megagametogenesis of Fouquieria fasciculata (Willd. ex Roem. & Schult.) Nash (Fouquieriaceae)The species of Mentzelia (Loasaceae) in Mexico, part 2: Mentzelia section Bartonia author indexsubject indexsearch form
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Botanical Sciences

On-line version ISSN 2007-4476Print version ISSN 2007-4298


SCHENK, John J.; GRANADOS MENDOZA, Carolina  and  ESTRADA-CASTILLON, Andres Eduardo. The species of Mentzelia (Loasaceae) in Mexico, part 1: Sectional diversity. Bot. sci [online]. 2021, vol.99, n.4, pp.886-896.  Epub Oct 18, 2021. ISSN 2007-4476.


Mentzelia (Loasaceae) is a genus of approximately 95 species that are largely distributed in western North America; however, much ambiguity remains regarding species in Mexico.


What species of Mentzelia occur in Mexico and how can they be distinguished?

Study species:



Fieldwork, herbarium studies and scanning electron microscopy were carried out to determine the diversity of Mentzelia species in Mexico.


Twenty-five species of Mentzelia occur in Mexico, of which four taxa are endemic to the country. Five of the six sections of Mentzelia occur in Mexico. Mentzelia section Mentzelia was the most species rich in Mexico (8 spp.), followed by section Trachyphytum (7 spp.), section Bartonia (6 spp.), section Bicuspidaria (3 spp.), and section Dendromentzelia (1 sp.). The sections have different distribution patterns, with some restricted to few areas and one widespread across most of Mexico.


This study is the first treatment of Mentzelia that encompasses all species and regions of Mexico, which includes approximately 26 % of the worldwide Mentzelia species. In-depth studies of the species in the region are needed to abate gaps in our knowledge on the extent of species distributions and to clarify species boundaries among some problematic species complexes.

Keywords : Desert flora; Madrean floristic region; misapplied nomenclature; plant systematics.

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