Page authors: Don Knoke, David Giblin
Eriogonum compositum
arrow-leaf buckwheat, northern buckwheat
WTU specimens
Other herbaria

Distribution: Chiefly east of the Cascades in Washington; Washington south to California, east to Idaho.

Habitat: Dry, open areas, rocky slopes and cliffs from low to moderate elevations in the mountains.

Flowers: May-July

Origin: Native

Conservation Status: Not of concern

Description:
General:

Stout perennial from a woody taproot, the broad crown somewhat shrubby, the several stems and leaves forming a plant to 5 cm. high and broad.

Leaves:

Basal, lanceolate to deltoid, more or less cordate-based, white-woolly beneath and green above, on petioles as long to several times as long as the blade.

Flowers:

Flowering stems stout and naked, the inflorescence a compound umbel 2-20 cm. broad, with linear bracts at the base of both primary and secondary umbels; involucres 6-10 mm. long, lobed about half their length, the lobes usually reflexed: tepals either creamy-white or lemon-yellow, about 5 mm. long, with a stipe-like base about 1 mm. long.

Identification Notes:

The usually large, heart-shaped leaves that are green on top and woolly white beneath will usually identify this species.

Accepted Name:
Eriogonum compositum Douglas ex Benth.
Publication: Edwards's Bot. Reg. 21: plate 1774. 1835.

Synonyms:
(none provided)
Infraspecies:
var. compositum – arrow-leaf buckwheat, northern buckwheat    The common variety in Oregon, and in south-central and southeast Washington
var. lancifolium – arrow-leaf buckwheat, northern buckwheat
var. leianthum – arrow-leaf buckwheat, northern buckwheat    Central Washington from the east slopes of the Cascades east to Idaho
Additional Resources:

PNW Herbaria: Specimen records of Eriogonum compositum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Eriogonum compositum checklist entry.

E-Flora BC: Eriogonum compositum atlas page.

CalPhotos: Eriogonum compositum photos.

USDA Plants: Eriogonum compositum information.

93 photographs:
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