Summary[edit] Description: English: Hydrolea ovata. Date: 16 May 2012. Source: http://plants.usda.gov/java/largeImage?imageID=hyov_001_ahp.tif. Author: Robert H. Mohlenbrock. USDA SCS. 1991. Southern wetland flora: Field office guide to plant species. South National Technical Center, Fort Worth. Courtesy of USDA NRCS Wetland Science Institute.