Page authors: Don Knoke, David Giblin
Eryngium petiolatum
Oregon eryngo, rush-leaf eryngo
WTU specimens
Other herbaria

Distribution: Chiefly along the Columbia River in Washington, south to the Willamette Valley.

Habitat: Low ground, especially in places submerged in spring and drier in summer.

Flowers: June-August

Origin: Native

Conservation Status: Threatened in Washington (WANHP)


Herbaceous perennial from fibrous roots and a short, simple crown, the stems 1.5-5 dm. tall, divaricately branched, often from near the base.


Basal leaves without blades, the petioles elongate, hollow; cauline leaves with progressively shorter petioles, the blades narrowly elliptic, up to 1 cm. wide, sub-entire or with spiny teeth.


Flowers sessile in heads up to 1 cm. wide; involucral bracts narrow, spine-toothed, much surpassing the flowers; bracteoles subtending the flowers narrowly linear, also exceeding the flowers; calyx lobes 5, 3 mm. long, acuminate; corolla 5-lobed, white.


Fruit ovoid, 2 mm. long, covered with tapering scales 1-1.5 mm. long.

Accepted Name:
Eryngium petiolatum Hook.

Synonyms & Misapplications:
Eryngium petiolatum Hook. var. juncifolium
Additional Resources:

PNW Herbaria: Specimen records of Eryngium petiolatum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Eryngium petiolatum checklist entry.

E-Flora BC: Eryngium petiolatum atlas page.

CalPhotos: Eryngium petiolatum photos.

USDA Plants: Eryngium petiolatum information.

41 photographs:
Group by