Salvador Arias

Learn More
A high proportion of plant species is predicted to be threatened with extinction in the near future. However, the threat status of only a small number has been evaluated compared with key animal groups, rendering the magnitude and nature of the risks plants face unclear. Here we report the results of a global species assessment for the largest plant taxon(More)
Echinocereus sección Triglochidiati ha sido aceptada en los más recientes tratamientos taxonómicos del género, sin embargo el número de especies que incluye ha variado entre una y 14. El presente trabajo tiene como objetivo delimitar el número de especies de la sección Triglochidiati para México a través de análisis multivariados, así como identificar los(More)
The phylogenetic relationships of Peniocereus (Cactaceae) species were studied using parsimony analyses of DNA sequence data. The plastid rpl16 and trnL-F regions were sequenced for 98 taxa including 17 species of Peniocereus, representatives from all genera of tribe Pachycereeae, four genera of tribe Hylocereeae, as well as from three additional outgroup(More)
BACKGROUND AND AIMS In Cactaceae, the areole is the organ that forms the leaves, spines and buds. Apparently, the genus Echinocereus develops enclosed buds that break through the epidermis of the stem adjacent to the areole; this trait most likely represents a synapomorphy of Echinocereus. The development of the areole is investigated here in order to(More)
The morphology and anatomy of the Backebergia militaris cephalium is characterized in comparison with its vegetative branch and with apical and lateral cephalia of other species. Our working hypothesis was that the B. militaris cephalium is more similar to the apical or lateral cephalia of other taxa than to its own vegetative branch. Our results revealed(More)
Seeds of 13 Pachycereus species and two Stenocereus species that have been suggested as closely related were examined with the scanning electron microscope. Quantitative features were evaluated using multivariate analysis in order to identify characters that distinguish them. Several species groups were recognized on the basis of 16 qualitative characters.(More)
The journal Cactáceas y Suculentas Mexicanas is a publication of the Mexican Society of Cactology, published since 1955. The articles are under the Creative Commons license. The journal Cactáceas y Suculentas Mexicanas is registered in the following indices: cab Abstracts, Periodica and Latindex. El costo de suscripción a la revista es de $400.00 para(More)
The morphological variation among 11 populations belonging to two endemic congener species of Neobuxbaumia, columnar cacti, was studied. One of our hypotheses was that N. mezcalaensis (Bravo) Backeb. with widespread distribution would show a higher variation of morphological characters and geographic–environmental variables compared with N. multiareolata(More)
  • 1