- a North American plant, Lachnanthes caroliniana (or L. tinctoria), having sword-shaped leaves, woolly, yellowish flowers, and a root that is red in color.
- any of various other plants having red roots, as the alkanet, Alkanna tinctoria, pigweed, Amaranthus retroflexus, and New Jersey tea, Ceanothus americanus.
- a bog plant, Lachnanthes tinctoria, of E North America, having woolly yellow flowers and roots that yield a red dye: family Haemodoraceae
- another name for pigweed (def. 1)
