naa a22 4500 510745563 CHVBK 20180411083044.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s12228-012-9294-5 doi (NATIONALLICENCE)springer-10.1007/s12228-012-9294-5 Mentzelia canyonensis (Loasaceae), a new species endemic to the Grand Canyon, Arizona, U.S.A [Elektronische Daten] [John Schenk, Wendy Hodgson, Larry Hufford] We describe Mentzelia canyonensis, a new species endemic to the Grand Canyon. Based on floral and fruit forms, shoot system architecture, and phylogenetic analyses of nuclear ribosomal DNA, we infer that M. canyonensis belongs to the ‘subshrubby' clade of Mentzelia section Bartonia, which includes the morphologically similar M. hualapaiensis, M. oreophila, M. puberula, and M. tiehmii. The new species is most similar to M. hualapaiensis, which is also known only from the Grand Canyon. These two species share leaf shape, subshrubby habits, corolla color, and fruit shape, although they differ in staminode presence and especially in leaf and corolla size. Principal component analyses of variation among floral and vegetative traits demonstrates that M. canyonensis and M. hualapaiensis share highly overlapping floral character space, but M. canyonensis occupies unique vegetative character space compared to similar species. A dichotomous key is provided to assist with identification of, and differentiation among, species of Mentzelia section Bartonia that occur in the Grand Canyon region. The New York Botanical Garden, 2013 Colorado Plateau nationallicence Colorado River nationallicence Grand Canyon National Park nationallicence endemic species nationallicence North American deserts nationallicence Mentzelia nationallicence Schenk John Department of Biological Science, Florida State University, 32306-4295, Tallahassee, FL, USA aut Hodgson Wendy Desert Botanical Garden, 1201 N. Galvin Parkway, 85008, Phoenix, AZ, USA aut Hufford Larry School of Biological Sciences, Washington State University, 99164-4236, Pullman, WA, USA aut Brittonia Springer US; http://www.springer-ny.com 65/4(2013-12-01), 408-416 0007-196X 65:4<408 2013 65 12228 https://doi.org/10.1007/s12228-012-9294-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12228-012-9294-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schenk John Department of Biological Science, Florida State University, 32306-4295, Tallahassee, FL, USA aut NATIONALLICENCE 700 1- Hodgson Wendy Desert Botanical Garden, 1201 N. Galvin Parkway, 85008, Phoenix, AZ, USA aut NATIONALLICENCE 700 1- Hufford Larry School of Biological Sciences, Washington State University, 99164-4236, Pullman, WA, USA aut NATIONALLICENCE 773 0- Brittonia Springer US; http://www.springer-ny.com 65/4(2013-12-01), 408-416 0007-196X 65:4<408 2013 65 12228 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer