rough pigweed Directory References Discover Does Ball Lightning Exist? The 10 Greatest Basketball Players of All Time Secret Service Code Names of 11 U.S. Presidents Why Is Missouri Called the Show Me State? All 119 References in “We Didn’t Start the Fire,” Explained 9 of the World’s Deadliest Spiders Timeline of the 1990s Contents rough pigweed plant Also known as: Amaranthus retroflexus, redroot Learn about this topic in these articles:pigweed In pigweed…base of the leafstalks; and rough pigweed, or redroot (A. retroflexus), is a stout plant up to 3 metres (about 10 feet) tall.Read More