Lomatium torreyi is a perennial herb growing up to 30 centimeters tall from a long taproot. There is generally no stem, the leaves and inflorescence emerging at ground level. The leaf blades are divided and subdivided into a mass of threadlike segments. The inflorescence is an umbel of yellow flowers.
Use of lomatium extracts or tinctures containing the resin (and possibly the coumarins) can, in some people, cause a whole-body rash. This herb may also lead to nausea in some people.
