Solidago gigantea
 Solidago gigantea common name Giant Goldenrod is a plant species in the genus Solidago. Its common name is giant goldenrod in reference to its height of up to 2 m tall rather large for the genus. It is a widespread species known from most of non-arctic North America east of the Rocky Mountains. It has been reported from every state and province from Alberta to Nova Scotia to Florida to Texas. Solidago gigantea is the state flower of Kentucky and Nebraska.