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
Pollination: Bees, flies, butterflies, beetles, wasps
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.
The smaller size and cuplike involucels distinguish it from the similar L. cous.
PNW Herbaria: Specimen records of Lomatium watsonii in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Lomatium watsonii checklist entry
OregonFlora: Lomatium watsonii information
E-Flora BC: Lomatium watsonii atlas page
CalPhotos: Lomatium watsonii photos