Trichostema lanceolatum

Trichostema lanceolatum, with the common names vinegarweed and camphor weed, is an annual flowering herb of the mint family native to western North America.

The common name 'vinegarweed' originated due to its foliage containing volatile oils that have a strong vinegar odor. The oils have phytotoxic properties, which help the plant compete by killing or injuring other plant species.