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McAdoo, David R.
Platanthera orbiculata (Pursh) Lindl.
Lesser roundleaved orchid, Roundleaf Rein Orchid, Round-leaved orchid
Synonym(s): Habenaria orbiculata, Habenaria orbiculata var. lehorsii, Habenaria orbiculata var. menziesii, Lysias orbiculata
USDA Symbol: PLOR4
1 stalk rising between 2 broadly elliptical or round basal leaves lying on ground, bearing up to 25 white or greenish-white, bilaterally symmetrical flowers in a raceme.
This species has the largest flowers of all western rein orchids. Several kinds of moths feed on nectar in the spur and probably pollinate the flower.
Bloom InformationBloom Time: Jun , Jul , Aug
, WV Canada: NB
, PE Native Distribution:
British Columbia east to Labrador and south to northern Oregon, northern Idaho, and northwestern Montana; also in northern regions of eastern United States. Native Habitat:
Moist forest floors.
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.
Record Last Modified: 2012-09-30
Research By: TWC Staff