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Montana Field Guides

Hooded Ladies'-tresses - Spiranthes romanzoffiana
Other Names:  Hooded Lady's-tresses, Hooded Ladies-tresses

Native Species

Global Rank: G5
State Rank: S4
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:
C-value: 6

External Links

State Rank Reason (see State Rank above)
A relatively common and widespread species of montane wet meadows, fens and other mesic sites in the mountains.
General Description
Stem 5–40 cm. Leaves narrowly oblanceolate, 3–15 cm long. Inflorescence viscid, 2–10 cm long with numerous tightly contiguous flowers in 3 or 4 columns; bracts 7–12 mm long. Flowers: lower sepals with spreading tips; hood 5–10 mm long; lip petal 7–11 mm long with a dilated, reflexed tip. Capsule 6–10 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Diagnostic Characteristics
Spike tightly spiraled, 3 ranked. Flowers large, usually 9 mm long or more. Lip markedly constricted near the center with a dilated apex.

Species Range
Montana Range


Range Comments
AK to NL south to CA, NM, NE, IA and NY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 140

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Wet meadows, fens, occasionally moist grasslands; valleys to subalpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

  • Additional ReferencesLegend:   View Online Publication
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    • Brackley, F.E. 1985. The Orchids of New Hampshire. Rhodora 87:1-117. A85BRA01PAUS
    • Cope, M.G. 1992. Distribution, habitat selection and survival of transplanted Columbian Sharp-tailed Grouse (Tympanuchus phasianellus columbianus) in the Tobacco Valley, Montana. M.Sc. Thesis. Bozeman, Montana: Montana State University. 60 p.
    • Correll, D.S. 1950. Native Orchids of North America, North of Mexico. Chronica Botanica Company, Waltham, Mass. USA. B50COR01PAUS
    • Fernald, M. L. 1950. Gray's manual of botany. Eighth edition. A handbook of the flowering plants and ferns of the central and northeastern United States and Adjacent Canada. American Book Co., New York.
    • Fultz, J.E. 2005. Effects of shelterwood management on flower-visiting insects and their floral resources. M.Sc. Thesis. Bozeman, MT: Montana State University. 163 p.
    • Gleason, H.A. 1952. New Britton & Brown. Illustrated Flora. Lancaster Press Inc. Lancaster, Pa. B52GLE01PAUS
    • Henry, L.K., W.E. Buker and D.L. Pearth. 1975. Western Pennsylvania Orchids. Castanea 40 (2):93-171.
    • Jones, W. W. 1901. Preliminary flora of Gallatin County. M.S. Thesis. Bozeman, MT: Montana State College. 78 pp.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Luer, C. A. 1975. The native orchids of the United States and Canada. The New York Botanical Garden, Bronx, New York. 361 pp.
    • McCance, R.M., Jr., and J.F. Burns, eds. 1984. Ohio endangered and threatened vascular plants: Abstracts of state-listed taxa. Division Natural Areas and Preserves, Ohio Dept. Natural Resources, Columbus. 635 pp.
    • Tuinstra, K. E. 1967. Vegetation of the floodplains and first terraces of Rock Creek near Red Lodge, Montana. Ph.D dissertation. Montana State University, Bozeman 110 pp.
    • Von Chamisso, Ludolf Adelbert. 1836. De Plantis in Expeditione Speculatoria Romanzoffiana observatis rationem dicunt, in Linnaea i-x, 1826-1836. Vol 3, part 1, pages 25-35. Orchid. arcticae. B36VON01PAUS.
    • Voss, E.G. 1972. Michigan Flora Part I. Kingsport Press, Bloomfield Hills, Mich. B72VOS01PAUS
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Citation for data on this website:
Hooded Ladies'-tresses — Spiranthes romanzoffiana.  Montana Field Guide.  .  Retrieved on , from