Artículo de publicación ISIA 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 evaluated to date under the International Union for Conservation of Nature (IUCN) Red List Categories and Criteria, the iconic Cactaceae (cacti). We show that cacti are among the most threatened taxonomic groups assessed to date, with 31% of the 1,478 evaluated species threatened, demonstrating the high anthropogenic pressures on biodiversity in arid lands. The distribution of threatened species and the predominant threatening processes and drivers are different to those described for other taxa. The most significant threat processes comprise land conversion to agriculture and aquaculture, collection as biological resources, and residential and commercial development. The dominant drivers of extinction risk are the unscrupulous collection of live plants and seeds for horticultural trade and private ornamental collections, smallholder livestock ranching and smallholder annual agriculture. Our findings demonstrate that global species assessments are readily achievable for major groups of plants with relatively moderate resources, and highlight different conservation priorities and actions to those derived from species assessments of key animal groupsConsejo Nacional de Ciencia y Tecnologia 000000000011820

Capitol Reef National Park lies in a relatively unexplored region of southcentral Utah. The diversity in geology and the elevation gradient (3,500-9,000 feet) allows for diverse vegetation including endemic and rare taxa (Welsh and Chatterley 1985). Previous floristic studies have been conducted in San Rafael Swell (Harris 1980) and the Henry Mountains (Neese 1981); however, aside from classification of coniferous habitat types (Youngblood and Mauk 1985), no community studies have been done in this region.

Watson based on sim¬ ilarities in stature and anthocarp structure and to A. fragrans Nuttall in the caulescent stems. A key to closely related taxa is included.

Capitol Reef National Park lies in a relatively unexplored region of southcentral Utah. The diversity in geology and the elevation gradient (3,500-9,000 feet) allows for diverse vegetation including endemic and rare taxa (Welsh and Chatterley, 1985). Previous floristic studies have been conducted in San Rafael Swell (Harris, 1980) and the Henry Mountains (Neese, 1981); however, aside from classification of coniferous habitat types (Youngblood and Mauk, 1985), no community studies have been done in this region.

Capitol Reef National Park lies in a relatively unexplored region of southcentral Utah. The diversity in geology and the elevation gradient (3,500-9,000 feet) allows for diverse vegetation including endemic and rare taxa (Welsh and Chatterley, 1985). Previous floristic studies have been conducted in San Rafael Swell (Harris, 1980) and the Henry Mountains (Neese, 1981); however, aside from classification of coniferous habitat types (Youngblood and Mauk, 1985), no community studies have been done in this region.