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Epipactis gigantea (Stream orchid)
Darling, Chloe

Epipactis gigantea

Epipactis gigantea Douglas ex Hook.

Stream Orchid, Chatterbox Orchid, Giant Hellebore

Orchidaceae (Orchid Family)



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

Leafy stems usually growing in dense patches and in the axils of each upper leaf 1 bilaterally symmetrical greenish-brown and pinkish flower.

The lower lip and "tongue" move when the flower is touched or shaken; thus giving it the alternate name Chatterbox.


From the Image Gallery

18 photo(s) available in the Image Gallery

Plant Characteristics

Duration: Perennial
Habit: Herb
Leaf Complexity: Simple
Size Class: 1-3 ft.

Bloom Information

Bloom Color: Pink , Orange , Yellow , Green , Purple , Brown
Bloom Time: Apr , May , Jun , Jul


USA: AZ , CA , CO , ID , MT , NM , NV , OK , OR , SD , TX , UT , WA , WY
Canada: BC
Native Distribution: British Columbia to Mexico; from the Pacific Coast east to the Rocky Mountains and the Black Hills.
Native Habitat: Ledges, Stream, river banks

Growing Conditions

Water Use: Medium
Light Requirement: Part Shade , Shade
Soil Moisture: Moist , Wet
Soil pH: Alkaline (pH>7.2)
CaCO3 Tolerance: High
Soil Description: Sandy, Sandy Loam Medium Loam, Clay Loam, Clay, Limestone-based, Calcareous Acid-based


Use Ornamental: Water garden, Bog or pond area
Conspicuous Flowers: yes
Fragrant Flowers: yes
Deer Resistant: High


Propagation Material: Root Division

National Wetland Indicator Status

This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

From the National Organizations Directory

According to the species list provided by Affiliate Organizations, this plant is on display at the following locations:

Lady Bird Johnson Wildflower Center - Austin, TX
Santa Barbara Botanic Garden - Santa Barbara, CA


Bibref 318 - Native Texas Plants: Landscaping Region by Region (2002) Wasowski, S. & A. Wasowski
Bibref 286 - Wildflowers of the Texas Hill Country (1989) Enquist, M.

Search More Titles in Bibliography

From the Archive

Wildflower Newsletter 1989 VOL. 6, NO.6 - Landscape Restoration, Wildflower Outlook, Wildflower Center Fall Festival, Dire...

Additional resources

USDA: Find Epipactis gigantea in USDA Plants
FNA: Find Epipactis gigantea in the Flora of North America (if available)
Google: Search Google for Epipactis gigantea


Record Modified: 2017-07-07
Research By: NPC

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