Page authors: David Giblin, Don Knoke
Spiranthes romanzoffiana
hooded ladies'-tresses

Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and across the northern U.S. and Canada to the Atlantic Coast.

Habitat: Seasonally moist to swampy areas, sometimes in disturbed areas.

Flowers: July-September

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Glabrous, herbaceous perennials from enlarged, fleshy roots, the stems 1-6 dm. tall.


Leaves several near the base of the stem, linear to oblong, 8-20 cm. long and 5-10 mm. broad, abruptly transitional upward to short, sheathing, lanceolate bracts.


Inflorescence a dense spike 3-12 cm. long, the flowers white to cream, aligned in 1-4 spiralling, vertical rows; floral bracts 10-20 mm. long, about equal to the tubular flowers, whitish; sepals viscid-pubescent, the upper one and the petals subequal, fused into a curved, tubular hood 7-12 mm. long; lip sharply reflexed, about as long as the sepals, the basal half strongly concave, constricted below the tip; column bearing the single anther 2-4 mm. long with a slender, forked terminal beak; ovary inferior



Accepted Name:
Spiranthes romanzoffiana Cham.
Publication: Linnaea. 3: 32. 1828.

Synonyms & Misapplications:
Gyrostachys stricta Rydb.
Ibidium strictum (Rydb.) House
Spiranthes romanzoffiana Cham. var. romanzoffiana [HC]
Spiranthes stricta (Rydb.) A. Nelson
Additional Resources:

PNW Herbaria: Specimen records of Spiranthes romanzoffiana in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Spiranthes romanzoffiana checklist entry.

OregonFlora: Spiranthes romanzoffiana information.

E-Flora BC: Spiranthes romanzoffiana atlas page.

CalPhotos: Spiranthes romanzoffiana photos.

USDA Plants: Spiranthes romanzoffiana information.

72 photographs:
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