Platanthera chorisiana (Cham.) Rchb.
Chamisso's rein orchid (Chimissso's orchid; small bog orchid)
Orchidaceae (Orchid family)

Introduction to Vascular Plants


© Hans Roemer     (Photo ID #25714)


E-Flora BC Static Map

Distribution of Platanthera chorisiana
Click here to view the full interactive map and legend

Species Information

Perennial herb from spindle-shaped stem-bases, with a few fibrous roots; stems 5-20 cm tall, with 1 or 2 bracts to 2 cm long.
Usually 2 or 3 nearly basal leaves nearly circular or egg-shaped to lanceolate, 2.5-6 cm long, about 1/2 as wide, sheathing.
Inflorescence a terminal, 5- to 18-flowered, crowded spike, the flowers small, greenish, unstalked, the lower flowers shorter than floral bracts; sepals 2 mm long, oblong, 1-veined, the upper sepal slightly hooded; petals strongly 3-veined, slightly shorter and wider than sepals; lip 1.5-2 mm long, nearly as wide, concavely curved, the margins slightly lobed, erect; spur barely 1 mm long, slightly curved, bulbous; column plump, about 1 mm long.
Capsules, ascending to erect.

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 Platanthera chorisiana

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)
298 60 780
Slope Gradient (%)
22 0 65

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

93 5 330
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
4 0 7
Modal Nutrient Regime
# of field plots
 species was recorded in:
Modal BEC Zone Class

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

CWH(16), MH(2), SBS(2)

Habitat and Range

Sphagnum bogs, bog forests, and swamps in the lowland and montane zones; infrequent in coastal BC; N to AK and S to WA; Japan.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Habenaria chorisiana Cham.