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Botanical Sciences
On-line version ISSN 2007-4476Print version ISSN 2007-4298
Abstract
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. https://doi.org/10.17129/botsci.2828.
Background:
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.
Questions:
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.
Methods:
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.
Results:
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.
Conclusions:
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.