[explorer.natureserve.org] Limited Range: Triteleia lugens is endemic to California and known from Lake, Monterey, Napa, San Benito, Solano, and Sonoma counties (CNPS 2001). (link added by Mary Ann Machi)

[floranorthamerica.org] Limited Range, Difference of Blossom Colors: Triteleia lugens has a disjunct distribution, being found in Lake, Napa, and Solano counties north of San Francisco Bay (with pale yellow flowers), and 140 miles away in Monterey and San Benito counties south of San Francisco Bay (with bright yellow flowers). (link added by Mary Ann Machi)