Nuts of the <i>Carya</i> genus.
"Courtesy of USDA Forest Service", rearranged by <a href="//commons.wikimedia.org/wiki/User:Melchoir" title="User:Melchoir">User:Melchoir</a>
USDA-NRCS PLANTS Database: <a rel="nofollow" class="external free" href="https://plants.usda.gov/java/largeImage?imageID=carya_001_avp.tif">http://plants.usda.gov/java/largeImage?imageID=carya_001_avp.tif</a>