Collinsonia canadensis, commonly called richweed[1] or stoneroot,[2] is a species of perennial herb in the mint family.

It is the most broadly distributed member of the genus Collinsonia,[3] ranging north to Quebec and south to Florida.

[5][6] Collinsonia canadensis can grow up to 4 feet (1.2 m) tall and has terminal clusters of tiny, tubular yellow flowers.

[7] It produces lemon-scented flowers in mid-summer, a time when little else is in bloom in densely shaded forests.

[3] However, European-American settlers in North America did not often use this species after they initially discovered it, due to it lacking any conspicuous toxic qualities.