Phytotaxa 391 (1): 057–068 ISSN 1179-3155 (print edition) https://www.mapress.com/j/pt/ PHYTOTAXA Copyright © 2019 Magnolia Press Article ISSN 1179-3163 (online edition) https://doi.org/10.11646/phytotaxa.391.1.4 Astragalus comonduensis and Calliandra pilocarpa (Fabaceae), two new species from Baja California Sur, Mexico EDUARDO ESTRADA CASTILLÓN1, JON P. REBMAN2 & JOSÉ ÁNGEL VILLARREAL QUINTANILLA3 1Facultad de Ciencias Forestales, Universidad Autónoma de Nuevo León, C.P. 67700, Linares, Nuevo León, México. E-mail:
[email protected] 2San Diego Natural History Museum, P.O. Box 121390, San Diego, California, 92112 E-mail:
[email protected] 3Departamento de Botánica, Universidad Autónoma Agraria Antonio Narro, C.P. 25315, Buenavista, Saltillo, Coahuila, México. E-mail:
[email protected] Abstract Two new species of Fabaceae, Astragalus comonduensis from A. sect. Inflati and Calliandra pilocarpa from C. sect. An- drocallis are described and illustrated. Both species are endemic to the state of Baja California Sur. Distribution, associated vegetation, rarity of observation, affinities to other related species, botanical illustrations, and various keys for identification of these plants in the region are also presented. Keywords: Leguminosae, Lotoideae, Mimosoideae, plant morphology, taxonomy Introduction The flora of the Baja California peninsula and adjacent islands in both the Pacific Ocean and the Gulf of California, located in northwestern Mexico is documented to have 3,892 plant taxa, included in 3,551 species, 1,093 genera and 186 families (Rebman et al., 2016). With respect to endemism, approximately 26% of the native flora of the region is endemic or near-endemic. This most recent study of the Baja California region’s flora significantly increased the region’s plant diversity through improved compilation of sp ecimen vouchers and also by incorporating many plant taxa that were new and described since Wiggins (1980) publication on the entire flora.