Goldenrod, a flowering perennial plant of the composite family. There are about 100 species, most of which grow in eastern North America. Goldenrods have rough, smooth, or hairy erect stems two to eight feet (60 to 240 cm) high. The leaves are usually slender and lance-shaped, but may be oval. The yellow, autumn-blooming flowers may grow in spikes, plumes, or loose clusters. Goldenrod is often mistaken for ragweed, whose pollen can cause hay fever. The goldenrod is the state flower of Kentucky and of Nebraska.
Goldenrod belongs to the genus Solidago of the family Compositae.