Page author: David Giblin
Corispermum pacificum
Pacific bugseed

Distribution: Occurring along the Lower Columbia River and east of the Cascades in Washington; central Washington south to northern Oregon, e to western Idaho.

Habitat: Roadsides and waste places.

Flowers: August-October

Origin: Native

Conservation Status: Not of concern


Spreading-erect annual, freely-branched especially near the base, the stems up to 6 dm. tall, often reddish-tinged, the herbage often covered with stiff, stellate hairs.


Leaves alternate, entire, linear to linear-lanceolate, 1-5 cm. long and up to 4 mm. broad, tipped with a sharp point, narrowed to short petioles.


Plant floriferous nearly throughout; flowers in short, axillary, crowded, bracteate spikes 1-3 cm. long and 4-6 mm. thick; bracts lanceolate below, broader above, 5-9 mm. long; perianth a single, papery scale opposite the bract; stamens 3-5, exerted; styles 2.


Fruit obovate to orbicular, 3-4 mm. long, strongly flattened and winged.

Accepted Name:
Corispermum pacificum Mosyakin
Publication: Novon. 5: 345, fig. 1A. 1995. 1995.

Synonyms & Misapplications:
Corispermum hyssopifolium L., misapplied [FNA4, HC]
Additional Resources:

PNW Herbaria: Specimen records of Corispermum pacificum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Corispermum pacificum checklist entry.

E-Flora BC: Corispermum pacificum atlas page.

CalPhotos: Corispermum pacificum photos.

USDA Plants: Corispermum pacificum information.

8 photographs:
Group by