Platanthera orbiculata (Pursh) Lindl.
large round-leaved rein orchid (lesser roundleaved orchid)
Orchidaceae (Orchid family)
Introduction to Vascular Plants
large round-leaved rein orchid (lesser roundleaved orchid)
Orchidaceae (Orchid family)
Introduction to Vascular Plants
Species Information
General:
Perennial herb, from fleshy, spindle-shaped stem-bases, with a few fibrous roots; stems 20-50 cm tall, without leaves, with 1-5 lance-shaped bracts.
Leaves:
Pair of basal leaves, opposite or nearly so, often lying on ground, round to oblong-elliptic, usually 6-16 cm long, 3-14 cm wide.
Flowers:
Inflorescence a terminal, loosely 5- to 25-flowered spike, bracted, the bracts shorter than the flowers; flowers whitish-green, the stalks 3-7 mm long; lower sepals 8-13 mm long, triangular to broadly lanceolate, somewhat bent back, the upper sepal kidney-shaped to broadly egg-shaped, 4-8 mm long, erect; petals shorter and lighter than sepals, egg-shaped to broadly lanceolate, bent back; lip 10-20 mm long, strap-shaped, whitish, hanging downward with slightly up-curved tip; spur somewhat club-shaped, curved, 15-25 mm long; column 4-5 mm long.
Fruits:
Capsules, erect, curved, to 20 mm long.
Illustration
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.
Illustration Source: The Illustrated Flora of British Columbia
Ecology
Ecological Framework for Platanthera orbiculata
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)
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 |
||
|
Avg |
Min |
Max |
|
| Elevation
(metres) |
745 | 8 | 2500 |
| Slope
Gradient (%) |
14 | 0 | 205 |
|
Aspect (degrees) |
185 | 0 | 360 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
3 | 0 | 8 |
| Modal
Nutrient Regime
Class |
C | ||
| #
of field plots species was recorded in: |
1111 | ||
| Modal
BEC Zone Class |
ICH | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
BWBS(123), CDF(12), CWH(86), ESSF(17), ICH(378), IDF(23), MH(10), MS(19), SBPS(54), SBS(349), SWB(1) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range
Dry to moist forests, bogs and swamps in the montane zone; infrequent in BC south of 55 degrees N, except rare on the coast; N to AK, YT and NT, E to NF and S to ME, MA, PA, NC, TN, MN, SD, MT, ID and WA.Status Information
Synonyms
Synonyms and Alternate Names:
Habenaria orbiculata (Pursh) Torr.
Habenaria orbiculata var. lehorsii Fern.
Habenaria orbiculata var. menziesii (Lindl.) Fern.
Lysias orbiculata (Pursh) Rydb.