Listera caurina Piper
northwestern twayblade
Orchidaceae (Orchid family)

Introduction to Vascular Plants


© Mark Gardiner     (Photo ID #66585)


E-Flora BC Static Map

Distribution of Listera caurina
Click here to view the full interactive map and legend

Species Information

Perennial herb from slender rhizomes, with fibrous roots; stems 10-30 cm tall, slender, with 2 leaves, glandular-hairy above.
Two, near middle of stem, roughly opposite, broadly egg-shaped, 2.5-7 cm long, 1.8-4.5 cm wide, abruptly tapered to base.
Inflorescence a few- to many-flowered, terminal raceme, the flowers greenish to yellowish; sepals 3-4 mm long, narrowly lanceolate, 1-veined, distinct, spreading; petals similar to sepals, 2.8-3.5 mm long; lip 4.5-7 mm long, about 3.5 mm wide, wedge- to egg-shaped, rounded or with shallow notch at tip, with a pair of lateral threadlike teeth at base; column 1.5-2.5 mm long.
Capsules, spreading, egg-shaped, to 7 mm long.

SourceThe Illustrated Flora of British Columbia


If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.


Ecological Framework for Listera caurina

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres)
497 0 1943
Slope Gradient (%)
26 0 350

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

237 0 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
4 0 8
Modal Nutrient Regime
# of field plots
 species was recorded in:
Modal BEC Zone Class

All BEC Zones (# of stations/zone) species was recorded in

BWBS(4), CWH(745), ESSF(42), ICH(80), IDF(3), MH(88), MS(6), SBPS(1), SBS(34)

Habitat and Range

Moist forests, bogs and meadows in the montane and subalpine zones; frequent on the coast, infrequent in NW BC and E of the Coast-Cascade Mountains south of 55 degrees N; N to AK, E to AB and S to WY, ID and CA.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Listera banksiana auct. non Lindl.
Neottia caurina (Piper) Szlach.
Ophrys caurina (Piper) Rydb.