Trichostema ruygtii, with the common name Napa bluecurls, is a species of flowering plant in the mint family.

[4] The plant is endemic to California in the northern San Francisco Bay Area, where it is known from the southern Mayacamas Mountains, in Napa County and into western Solano County.

[2] Its habitats include chaparral, oak woodland, mixed evergreen forest, and vernal pools in grasslands.

[5] Trichostema ruygtii is an annual herb that grows under 5 decimetres (1.6 ft) in height.

Trichostema ruygtii is listed as a Critically endangered species on the California Native Plant Society Inventory of Rare and Endangered Plants.