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vol.99 issue4The species of Mentzelia (Loasaceae) in Mexico, part 1: Sectional diversityGesneriaceae, a little studied family in Mexico: Richness and taxonomy in the Tabasco state 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 2: Mentzelia section Bartonia. Bot. sci [online]. 2021, vol.99, n.4, pp.897-909.  Epub Oct 18, 2021. ISSN 2007-4476.


Mentzelia (Loasaceae) is primarily distributed in western North America. The genus is classified into six monophyletic sections, among which species of section Bartonia are particularly poorly understood.


What species of Mentzelia section Bartonia occur in Mexico? What are the species distribution ranges and what are their defining attributes?

Study species:

Mentzelia section Bartonia.


Field, herbarium, distribution, and scanning electron microscopy studies were conducted to assess species diversity. Seed coat microsculpture patterns were evaluated to confirm species identities and understand their distributions throughout Mexico.


Six species from section Bartonia were recognized, with taxa distributed into either the Chihuahuan or Sonoran deserts. Mentzelia longiloba var. pinacatensis is the only Mexican endemic.


Although this work comprehensively addressed the species of section Bartonia in Mexico, two groups will continue to present identification challenges: the M. longiloba and M. mexicana-M. saxicola complexes. Overlapping and variable characters will continue to complicate species identification in the M. longiloba complex, while the late-season loss of primary leaves will obscure species identification between M. mexicana and M. saxicola.

Keywords : Chihuahuan Desert; desert flora; plant taxonomy; Sonoran Desert.

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