Ethnobotany. Many species of Lomatium have been used as food or as medicine by the First Peoples of North America.
Description by the Jepson. Plant 1–4.5 dm; taproot stout; herbage green, finely scabrous to nearly glabrous. Stem leafy. Leaf: petiole 2–12 cm, widely sheathing basally; blade 5–15 cm, oblong-ovate to triangular-ovate, ternate-pinnately or pinnately dissected, segments crowded, 1–5 mm, oblong, obtuse; cauline leaves like basal, sheaths flared. Inflorescence: peduncle 2.5–25 cm; bractlets 5–10, 3–7 mm, generally lanceolate to oblanceolate, acute, ± scarious; rays 10–15, 2–7 cm, spreading-ascending, unequal, ± webbed; pedicels 5–15 mm, webbed. Flower: corolla yellow; ovary generally roughened. Fruit 8–15 mm, oblong to elliptic, generally roughened; wings generally > body in width; oil tubes per rib-interval 1–4. Chromosomes: 2n=22. Ecology: Sagebrush, grassy slopes, pine woodland. Elevation: 600–1900 m. . Bioregional distribution: Klamath Ranges, North Coast Ranges (serpentine), Modoc Plateau . Distribution outside California: c Oregon, w Nevada