E-Flora BC: Electronic Atlas of the Flora of British Columbia

Platanthera obtusata (Banks ex Pursh) Lindl. subsp. obtusata
one-leaved rein orchid (bluntleaved orchid)
Orchidaceae (Orchid family)

Introduction to Vascular Plants
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Distribution of Platanthera obtusata subsp. obtusata
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Species Information

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General:
Perennial herb, from a few fleshy-tuberous roots; stems 10-30 cm tall, without leaves.
Leaves:
Single basal leaf, oblanceolate to elliptic or egg-shaped, 5-15 cm long, 1-5 cm wide, blunt-tipped, long-tapering to base.
Flowers:
Inflorescence a terminal, loosely 3- to 15-flowered spike, bracted; flower bracts green and up to 15 mm long below, yellowish and much reduced above; flower stalks 1-5 mm long; flowers pale green to yellow-green, sometimes the lip or petals whitish; lower sepals 4-6 mm long, elliptic-lanceolate, somewhat bent back, the upper sepal kidney-shaped to nearly round, 3-4 mm long, somewhat erect, arching over column; petals broadly lanceolate, curved upward, contacting the upper sepal; lip 5-10 mm long, lance-linear, greenish-white, hanging downward with slightly up-curved tip; spur slender, pointed, tapering from base, somewhat curving, as long as lip; column 2-3.5 mm long.
Fruits:
Capsules, erect, ellipsoid, to 10 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to wet forests, bogs, swamps and streambanks in the montane zone; infrequent throughout BC, except absent from the coast; N to AK, YT and NT, E to NF and S to ME, MA, NY, MI, WI, MN, CO, UT, ID and OR.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Platanthera obtusata ssp. obtusata

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

Minimum

Average

Maximum

Elevation (metres) 590 1069 1550
Slope Gradient (%) 0 9 36
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
135 290 350
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
3 3 4
Modal Nutrient Regime
Class
D
Number of field plots
 species was recorded in:
12
Modal BEC Zone Class
BWBS
All BEC Zones (# of stations/zone) species was recorded in: BWBS(2), ICH(1), IDF(2), MS(1)

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is montane boreal & cool temperate.

Synonyms and Alternate Names

Habenaria obtusata (Banks ex Pursh) Richardson
Habenaria obtusata var. collectanea Fernald
Lysiella obtusata (Banks ex Pursh) Rydb.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References