Polygonum cuspidatum* /Smartweed Family
This plant is sometimes called Bamboo (although it is in the Buckwheat Family and Bamboo is in the Grass Family) due to the jointed stems. It can become an invasive plant. There are large patches of this plant along I-75 near Caryville.
Where seen: Caryville, TN; Oliver Springs, TN, Great Smoky Mountains NP, Warriors' Path SP