Summary[edit] Description: English: Dulichium arundinaceum from Robert H. Mohlenbrock. USDA SCS. 1989. Midwest wetland flora: Field office illustrated guide to plant species. Midwest National Technical Center, Lincoln. Courtesy of USDA NRCS Wetland Science Institute. Date: 1989. Source: Iris chrysophylla. Author: Robert H. Mohlenbrock. Permission (Reusing this file): Public domainPublic domainfalsefalse. : This image is a work of the Natural Resources Conservation Service, part of the United States Department of Agriculture, taken or made as part of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain in the United States.: .