Bare-stem desert parsley is a fairly easy to identify desert parsley (at least in the Pacific Northwest) due to the erect, solitary to several hollow stems which inflate or increase greatly in diameter directly beneath the inflorescence. The naked stems range from 20-90 cm high and are generally both glabrous and blue-glaucous. The firm leaves are found only near the base and are ternately or ternate-pinnately 1-3 times compound with 3-30 veiny, often petiolate lanceolate to ovate leaflets from 2-9 cm long and 1-6 cm wide. The leaflet margins may be entire or may be toothed at the tips.
The inflorescence is an umbel of numerous small umbelets which are usually widely spaced when in flower. The stems which hold the umbelets in the umbel extend unequally from 6-20 cm. The flowers are yellow. The fruit is 7-15 mm long, oblong to elliptic in shape, narrowing to a short beaklike tip. The wings of the fruit are up to one-half as wide as the body.
Bare-stem desert parsley maybe found from the lowlands to moderate elevations in the mountains on dry, open or sparsely wooded places, and is often mixed with sagebrush or ponderosa pine.
Bare-stem desert parsley may be found from southern British Columbia south along both sides of the Cascade Mts. through Washington and Oregon to central California and east to southwestern Alberta, western and southern Idaho, and western Utah.