<i><a href="//commons.wikimedia.org/wiki/Arnica_latifolia" title="Arnica latifolia">Arnica latifolia</a></i> from Robert H. Mohlenbrock. USDA NRCS. 1992. Western wetland flora: Field office guide to plant species. West Region, Sacramento. Courtesy of USDA NRCS Wetland Science Institute.
Robert H. Mohlenbrock
1992
<a rel="nofollow" class="external free" href="https://plants.usda.gov/java/largeImage?imageID=arla8_001_avp.tif">http://plants.usda.gov/java/largeImage?imageID=arla8_001_avp.tif</a>