Description: Arizona Centaury (Centaurium calycosum). Date: 9/16/07. Source: USDA Plants database. Author: James D. Morefield. Permission(Reusing this file): This image is not copyrighted and may be freely used for any purpose. Please credit the artist, original publication if applicable, and the USDA-NRCS PLANTS Database. The following format is suggested and will be appreciated: James D. Morefield @ USDA-NRCS PLANTS Database / USDA NRCS. 1992. Western wetland flora: Field office guide to plant species. West Region, Sacramento, CA. http://plants.usda.gov/java/usageGuidelines?imageID=ceca3_002_avp.tif.