Eutrochium purpureum, commonly known as purple Joe-Pye weed,<ref name=gobotany>Template:Go Botany</ref> kidney-root,<ref>Template:Cite book</ref> sweetscented joe pye weed,<ref>Template:PLANTS</ref> sweet Joe-Pye weed, gravel root, or trumpet weed is an herbaceous perennial plant in the sunflower family. It is native to eastern and central North America, from Ontario east to New Hampshire and south as far as Florida, Louisiana, and Oklahoma.<ref>Template:BONAP</ref>
Eutrochium purpureum is a clump-forming herb that grows to Template:Convert tall and about Template:Convert wide. Plants are found in full sun to part shade in mesic to wet soils. Stems are upright, thick, round, and purple, with whorls of leaves at each node. As the plant begins to bloom the stems often bend downward under the weight of the flowers. The leaves grow to Template:Convert long and have a somewhat wrinkled texture. The purplish flowers are produced in large loose, convex shaped compound corymbiform arrays. Plants bloom mid to late summer and attract much activity from insects that feed on the nectar produced by the flowers. This species hybridizes readily with other species of Eutrochium and where this species and those species overlap in distribution the resulting plants can be difficult to resolve to a specific taxon.<ref>Template:EFloras</ref> There are two varieties that differ in the pubescence of the stems and foliage, but many more have been proposed in the past, thought most authorities now accept that this is a variable species and population variations integrate.
Eutrochium purpureum is sometimes cultivated and has escaped from cultivation in parts of New Zealand.<ref name="fnz-genus">Template:Cite web</ref><ref name="Botanica 359">"Botanica. The Illustrated AZ of over 10000 garden plants and how to cultivate them", p 359. Könemann, 2004. Template:ISBN</ref>