water whorlgrass (<i><a href="//commons.wikimedia.org/wiki/Catabrosa_aquatica" title="Catabrosa aquatica">Catabrosa aquatica</a></i>)
Gary Larson. Attribution requested: <b>Gary Larson @ USDA-NRCS PLANTS Database / USDA NRCS. 1992.</b>
1992
USDA: <a rel="nofollow" class="external text" href="https://plants.usda.gov/java/largeImage?imageID=caaq3_002_avp.tif">caaq3 002 avp</a>. Western wetland flora: Field office guide to plant species. West Region, Sacramento.