Title: Collinsonia
Additional Names: Stone-root; knob root; horse balm; richweed
Literature References: Root of Collinsonia canadensis L., Labiatae. Habit. North America, from Ontario to Florida and west to Kansas. Constit. Resin, saponin, tannin, mucilage.
Colloidal Bismuth Subcitrate Colocynthin Colony Stimulating Factors Colostrokinin Colpormon

C. canadensis
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Lamiales
Family: Lamiaceae
Subfamily: Nepetoideae
Tribe: Elsholtzieae
Genus: Collinsonia
Type species
Collinsonia canadensis

Collinsonia anisata
Collinsonia canadensis
Collinsonia punctata
Collinsonia verticillata

Collinsonia is a genus of flowering plants in the family Lamiaceae. It is endemic to eastern North America.[1] It was named for the English botanist Peter Collinson (1694–1768) by Linnaeus in Species Plantarum in 1753.[2] It is in the tribe Elsholtzieae, a small tribe of only 5 genera.[3] In order of their number of species, they are Elsholtzia, Mosla, Collinsonia, Perilla, and Perillula.

The circumscription of species in Collinsonia has been a source of confusion, and many names have been published.[4] Some authors have recognized as many as 10 species. In 2006, the genus was revised with only four species recognized.[5]