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Montana Field Guide

Montana Field Guides

Fairy Slipper - Calypso bulbosa

Native Species

Global Rank: G5
State Rank: S4S5

Agency Status
MNPS Threat Rank:
C-value: 6

External Links

General Description
Stems 5–20 cm, scapose with 2 sheathing bracts. Leaf basal, solitary, petiolate; blade glabrous, ovate, 3–6 cm long. Inflorescence a solitary flower subtended by a purplish, linear bract, 8–20 mm long. Flowers: sepals purple, lanceolate, 14–22 mm long, erect; upper 2 petals similar; lip petal forming a white- and purple-spotted pouch, ca. 2 cm long, open at the top, yellow within; margin of the orifice (lamina) bearded with paired horns near the front; column obovate, yellowish, hood-like over the lip. Capsule lanceoloid, 20–35 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

We have varieties occidentalis (Holz.) B. Boivin and americana (R. Br). Luer.

Species Range
Montana Range


Range Comments
Circumboreal south to CA, AZ, CO, MI and NY (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 98

(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)


  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Johnson, T. W. 1982. An analysis of pack and saddle stock grazing areas in the Bob Marshall Wilderness. M.Sc.Thesis. Bozeman, MT: Montana State University. 105 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Fairy Slipper — Calypso bulbosa.  Montana Field Guide.  .  Retrieved on , from