Page author: David Giblin
Poterium sanguisorba
WTU specimens
Other herbaria

Distribution: Chiefly west of the Cascades in Washington; occurring in many areas of North America.

Habitat: Waste places.

Flowers: June-August

Origin: Introduced

Conservation Status: Not of concern

Description:
General:

Herbaceous perennial from a branched, woody base, the flowering, leafy stems 2-6 dm. tall.

Leaves:

Basal leaves several, pinnate, the leaflets 9-17, oval, 1-2 cm. long, coarsely serrate; cauline leaves reduced but with leaf-like stipules.

Flowers:

Inflorescence of ovoid, dense spikes on long peduncles, 8-20 mm. long, each flower subtended by a papery, ovate bract and 2 lateral bractlets; flowers mostly imperfect, the lower ones staminate, the upper ones pistillate; calyx urn-shaped, greenish to rose-tinged, the 4 lobes broad, spreading and petal-like; petals none; stamens about 12, pistils 2.

Fruit:

Fruiting calyx 4-5 mm. long, woody and warty.

Accepted Name:
Poterium sanguisorba L.

Synonyms & Misapplications:
(none provided)
Infraspecies:
var. polygamum    Introduced, common in eastern United States, but infrequent in the Pacific Northwest.
Additional Resources:

PNW Herbaria: Specimen records of Poterium sanguisorba in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Poterium sanguisorba checklist entry.

E-Flora BC: Poterium sanguisorba atlas page.

CalPhotos: Poterium sanguisorba photos.

USDA Plants: Poterium sanguisorba information.

13 photographs:
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