Page authors: Don Knoke, David Giblin
Lomatium watsonii
Watson's biscuit-root, Watson's desert-parsley

Distribution: Occurring east of the Cascades crest in central and south-central Washington; central Washingotn to Wasco County, Oregon.

Habitat: Open hillsides, often with sagebrush, from valleys to subalpine.

Flowers: May-July

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Perennials with an elongate, thickened taproot, the plants acaulescent.


Leaves attached to the top of the tuberous taproot, pinnately or ternate-pinnately divided, the leaf segments narrow, 1-5 mm. long


Rays of the umbel 5-20, elongating unequally; flowers yellow; involucel of broad bracklets which are fused from about halfway nearly to the tip, cup-like; pedicels short, 1-3 mm. long.


Fruit usually finely puberulent, ovate, 6-7 mm. long and about half that wide, the wings less that half as wide as the body.

Identification Notes:

The smaller size and cuplike involucels distinguish it from the similar L. cous.

Accepted Name:
Lomatium watsonii (J.M. Coult. & Rose) J.M. Coult. & Rose
Publication: Contr. U.S. Natl. Herb. 7(1): 211. 1900.

Synonyms & Misapplications:
Lomatium frenchii Mathias & Constance
Additional Resources:

PNW Herbaria: Specimen records of Lomatium watsonii in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Lomatium watsonii checklist entry.

E-Flora BC: Lomatium watsonii atlas page.

CalPhotos: Lomatium watsonii photos.

USDA Plants: Lomatium watsonii information.

24 photographs:
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