Page authors: Don Knoke, David Giblin
Maianthemum dilatatum
wild lily-of-the-valley, may-lily, two-leaf false Solomon's-seal
WTU specimens
Other herbaria

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

Habitat: Shady, moist areas, open to dense woods, sea level to moderate elevations in the mountains.

Flowers: May-July

Origin: Native

Conservation Status: Not of concern


Perennial herbs from wide-spreading rhizomes, the erect, unbranched flowering stems 1-3.5 dm. tall.


Leaves cordate, 5-11 cm. long and broad, with slender petioles 2-9 cm. long; those on the flowering stem usually 2, occasionally 1 or 3.


Inflorescence a raceme 3-6 cm. long, usually simple, often with several pedicels at one node; tepals 4, distinct, white, 2.5 mm. long; stamens 4, attached at the base of the tepals, about 1.5 mm. long; pistil 2-celled, style 1, bi-lobed.


Fruit a red berry, globose, 5 mm. long, few-seeded.

Accepted Name:
Maianthemum dilatatum (Alph. Wood) A. Nelson & J.F. Macbr.
Publication: Bot. Gaz. 61: 30. 1916. 1916.

Synonyms & Misapplications:
Maianthemum bifolium (L.) F.W. Schmidt var. dilatatum Alph. Wood
Maianthemum bifolium (L.) F.W. Schmidt var. kamtschaticum (J.F. Gmel.) Jeps.
Maianthemum kamtschaticum (J.F. Gmel.) Nakai
Unifolium dilatatum (Alph. Wood) Greene
Unifolium kamtschaticum (J.F. Gmel.) Gorman
Additional Resources:

PNW Herbaria: Specimen records of Maianthemum dilatatum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Maianthemum dilatatum checklist entry.

E-Flora BC: Maianthemum dilatatum atlas page.

CalPhotos: Maianthemum dilatatum photos.

USDA Plants: Maianthemum dilatatum information.

32 photographs:
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