Resumen

PEREZ-NICOLAS, M. L. et al. Geographic distribution of species of Euphorbia sect. Poinsettia with potential ornamental use in Mexico. Polibotánica [online]. 2020, n.50, pp.165-189.  Epub 25-Nov-2020. ISSN 1405-2768.  https://doi.org/10.18387/polibotanica.50.12.

In recent years, species of the genus Euphorbia with potential for ornamental use have been proposed in response to the demand for flower growers to have Mexican varieties since most of the ornamental varieties that are marketed come from abroad. This work is aimed to determine the distribution of Mexican species of Euphorbia subsect. Stormiae and evaluate if they can be used as ornamental plants. A data matrix was prepared with herbarium specimens and field collections, distribution maps were prepared and analyzed based on growth habit, climate types and soil types with Geographic Information Systems. The potential for use of a species was defined based on aesthetic values, and it was documented in which phase of the process of generating new horticultural crops they are. The states where the highest number of species are located are: Jalisco (6), Nayarit (5) and Sinaloa (5). Based on their geographic distribution, two groups were established: annual herbs with a wide distribution and perennial herbs or shrubs with a restricted distribution. The species mainly in warm and termperate subhumid climates and on lithosol, regosol, and cambisol soils. The aesthetic values that were presented mostly correspond to showy bracts. Euphorbia cornastra, E. pulcherrima and E. strigosa are in phase II of the research process towards new crops. The species are distributed mainly in the states located on the Pacific slope of Mexico and most of them are endemic. The potential for ornamental use of a species is defined both by its aesthetic value and by their behaviour when cultivated.

Palabras llave : Euphorbiaceae; endemism; SIG; subgenus Chamaesyce.

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