Collinsonia canadensis
（重定向自Richweed）
![](/Images/godic/202502/07/Collinsonia_canadensis_flowers3700.jpg")
Collinsonia canadensis is a perennial medicinal herb in the mint family. Common names include Canada Horsebalm, Richweed, Hardhack, Heal-All, Horseweed, Ox-Balm and Stone root. It is native to eastern North America from Quebec south to Florida and as far west as Missouri, although it is mainly found east of the Mississippi River. It is endangered in Wisconsin.