Trichostema ruygtii, with the common name Napa bluecurls, is a species of flowering plant in the mint family.[1] It was first described to science in 2006.[2]
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.[1]
Its habitats include chaparral, oak woodland, mixed evergreen forest, and vernal pools in grasslands.[3]
Trichostema ruygtii is an annual herb that grows under 5dm in height. The stems and lanceolate leaves have short hairs.[1]
The flowers are a pale lavender in color. Its bloom period is June to October.[1]
The species is threatened by agriculture and development. Trichostema ruygtii is listed as a Critically endangered species on the California Native Plant Society Inventory of Rare and Endangered Plants.[4]