Agastache urticifolia is a species of flowering plant in the mint family known by the common name nettle-leaf giant hyssop or horse nettle. It is native to western North America from British Columbia to California to Colorado, where it grows in many habitat types. This is an aromatic perennial herb growing an erect stem with widely spaced leaves, each lance-shaped to nearly triangular and toothed. The leaves are up to 8 centimeters long and 7 wide. The inflorescence is a dense spike of many flowers. Each flower has long sepals tipped with bright purple and tubular corollas in shades of pink and purple. The fruit is a light brown, fuzzy nutlet about 2 millimeters long. The plant was used medicinally by several Native American groups, especially the leaves.
Isotype for Agastache glaucifolia A. Heller Catalog Number: US 416802 Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany Verification Degree: Card file verified by examination of original publication Preparation: Pressed specimen Collector(s): A. A. Heller Year Collected: 1902 Locality: Between Knight Valley & Mark Westsprings., Sonoma, California, United States, North America
Comments: Some consider this species to be comprised of two varieties (Kartesz 1999; Cronquist et al. 1984; Hitchcock and Cronquist 1974; Hitchcock et al. 1959; not Hickman 1993; Munz 1959; Abrams 1951).