Trichostema simulatum is a species of flowering plant in the mint family known by the common name Siskiyou bluecurls. It is native to the southern Cascade Range in northern California and southern Oregon, and in the northern Sierra Nevada in California. Trichostema simulatum is an annual herb grows up to about 40 centimetres (16 in) tall. Its aromatic foliage is coated in long and short glandular and nonglandular hairs. The lance-shaped leaves are 2 to 5 centimeters long. The inflorescence is a long cyme of flowers growing from the stem between each leaf pair. Each flower has a hairy calyx of sepals with triangular points and a tubular, lipped purple corolla. The four protruding stamens are curved.