Page authors: Don Knoke, David Giblin
Phacelia linearis
thread-leaf phacelia, thread-leaf scorpion-weed

Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.

Habitat: Common in dry, open places in the foothills and plains to moderate elevations in the mountains.

Flowers: April-June

Origin: Native

Growth Duration: Annual

Conservation Status: Not of concern


Erect annual, the stem densely puberulent, simple or branched, 1-5 dm. tall.


Leaves cauline, nearly sessile, 1.5-11 cm. long and 1.5-12 mm. wide, often with a pair of narrow lobes below the middle, otherwise entire.


Flowers crowded toward the ends of the branches; calyx divided nearly to the base, the 5 lobes narrow, bristly; corolla broadly bell-shaped, blue-lavender, the limb 8-18 mm. wide; stamens not exerted; style shallowly 2-cleft.

Accepted Name:
Phacelia linearis (Pursh) Holz.
Publication: Contributions from the United States National Herbarium 3(4): 242. 1895.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Phacelia linearis in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Phacelia linearis checklist entry.

E-Flora BC: Phacelia linearis atlas page.

CalPhotos: Phacelia linearis photos.

USDA Plants: Phacelia linearis information.

74 photographs:
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