Trichostema simulatum is a species of flowering plant in the mint family known by the common name Siskiyou bluecurls.

It grows in open and generally sandy or gravelly sites of Yellow pine forests and adjacent habitats, at 500–1,600 metres (1,600–5,200 ft) in elevation.

Its aromatic foliage is coated in long and short glandular and nonglandular hairs.

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.