Trichostema laxum is a species of flowering plant in the mint family, known by the common name turpentine weed from the foliage's scent.

[1][2] The annual plant is native to northern California and Oregon, at elevations below 1,700 metres (5,600 ft).

[1] Trichostema laxum is an annual herb approaching 5 decimetres (1.6 ft) in maximum height.

[1] Its aromatic foliage, with a strong turpentine odor, is coated in glandular and nonglandular hairs.

Each flower has a hairy calyx of green or reddish sepals and a tubular, lipped purple corolla.