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Calypso bulbosa var. occidentalis (Western fairy-slipper)
Glase, Terry

Calypso bulbosa var. occidentalis

Calypso bulbosa (L.) Oakes var. occidentalis (Holz.) B. Boivin

Western Fairy-slipper, Pacific Fairy-slipper

Orchidaceae (Orchid Family)

Synonym(s): Calypso bulbosa ssp. occidentalis


USDA Native Status: L48 (N), AK (N), CAN (N)

Calypso bulbosa is chlorophyllous but also hemi-mycoheterotrophic; that is, it makes it own food, but also utilizes at least one fungus species to provide some of its carbon intake. The known fungi involved is Thanatephorus ochraceus, a saprotroph.


From the Image Gallery

19 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Fruit Type: Capsule
Size Notes: Up to about 9 inches tall.

Bloom Information

Bloom Color: White , Red , Pink
Bloom Time: Mar , Apr , May , Jun


USA: AK , CA , ID , MT , OR , WA
Canada: BC

Web Reference

Webref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Webref 23 - Southwest Environmental Information Network (2009) SEINet - Arizona Chapter

Additional resources

USDA: Find Calypso bulbosa var. occidentalis in USDA Plants
FNA: Find Calypso bulbosa var. occidentalis in the Flora of North America (if available)
Google: Search Google for Calypso bulbosa var. occidentalis


Record Modified: 2023-04-24
Research By: Joseph A. Marcus

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