Page authors: Ben Legler, David Giblin
Boykinia intermedia
greater boykinia, Sierran brookfoam

Distribution: Occurring on the Olympic Peninsula in Washington; Washington south along the coast to central Oregon.

Habitat: Moist woods, meadows, streambanks, roadside ditches.

Flowers: June-September

Origin: Native

Conservation Status: Not of concern


Glandular-pubescent, herbaceous perennial from stolons or rhizomes, the stem 3-7 dm. tall.


Lower leaves long-petioled, with brownish, membranous stipules, the petioles becoming much shorter and the stipules more pronounced upward; blades reniform, up to 20 cm. broad, unequally 3- to 7-lobed halfway to the base and again 2-3 times toothed.


Inflorescence a many-flowered, open, pyramidal panicle; hypanthium campanulate; sepals 2-3 mm. long; petals 5, white, 3-7 × 1-3 mm. long, spatulate to ovate, tapered to base; stamens 5, opposite the calyx lobes; ovary half inferior.


Carpels 2; seeds ellipsoid, 0.7 mm. long, black.

Identification Notes:

Differs from Boykinia major s.s., which does not occur in Washington, by its stoloniferous habit, more slender stems, pyramidal inflorescences (vs. flat-topped), smaller stipules, campanulate hypanthium (vs. saucer-shaped), and petals tapered to base (vs. strongly clawed).

Accepted Name:
Boykinia intermedia (Piper) G.N. Jones
Publication: Bot. Surv. Olympic Penins. 168. 1936. 1936.

Synonyms & Misapplications:
Boykinia major A. Gray, misapplied [FNA8, HC, HC2]
Boykinia major A. Gray var. intermedia Piper [HC]
Additional Resources:

PNW Herbaria: Specimen records of Boykinia intermedia in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Boykinia intermedia checklist entry.

E-Flora BC: Boykinia intermedia atlas page.

CalPhotos: Boykinia intermedia photos.

USDA Plants: Boykinia intermedia information.

21 photographs:
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