Abstract

FERNANDEZ-NAVA, Rafael; ARREGUIN-SANCHEZ, María de la Luz  and  JORGE CRUZ, Coral Yamileth. Taxonomic characteristics of Colubrina species (Rhamnaceae) in Mexico, based on foliar architecture and epidermal surfaces. Polibotánica [online]. 2024, n.57, pp.1-22.  Epub Apr 19, 2024. ISSN 1405-2768.  https://doi.org/10.18387/polibotanica.57.1.

The architecture and epidermal surfaces of: Colubrina angustior (M. C. Johnston) Nesom, C. greggii S. Wats., C. lanulosa (M. C. Johnston) Fernández & Arreguín, C. macrocarpa (Cav.) G. Don var. macrocarpa, C. stricta Engelm. ex Blankinship, C. texensis (Torrey & Gray) A. Gray and C. yucatanensis (M. C. Johnston) Nesom, belonging to the Family Rhamnaceae are described and illustrated. The characters used for the separation of the taxa were the different types of venation, the insertion of the trichomes, the shape of the epidermal cells and their walls on the adaxial and abaxial surfaces, the presence or absence of free veins in the veins of third and fourth category, as well as the types of stomata; in none of the taxa were glands found in the marginal teeth. In addition to the descriptions and photomicrographs of the taxa, a dichotomous key was developed to differentiate the species and varieties. It is also proposed that C. macrocarpa var. lanulosa has a status of new species, because marked differences were found with the type variety of C. macrocarpa var. macrocarpa; Colubrina lanulosa (M. C. Johnston) Fernández & Arreguín is proposed as comb. et stat. nov.

Keywords : leaf morphology; leaf venation; dichotomous key; new species; subgenus Serratifolia.

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