Amerorchis rotundifolia (Banks ex Pursh) Hultén - Round-leaved Orchid


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Amerorchis rotundifolia - (image 1 of 4)



Family: Orchidaceae


Synonymous with Orchis rotundifolia and Galearis rotundifolia.


 Calcareous wet woods and swamps.




Greenland to AK, south to Quebec, northern NY, MI, MN, and British Columbia. Rare in most U.S. states and possibly extirpated in NY, VT, and NH.


Herbaceous perennial; leaf solitary, elliptic to ovate or obovate, 4-11 cm; scape 10-25 cm, slender; bracts lance linear, 6-15 mm; sepals and lateral petal pale purple to white, oblong-obovate, 5-8 mm, the petal slightly narrow than the sepals; 2 lateral petals and upper sepal connivent, the lateral sepal spreading; lip white, spotted to pink-purple, 6-9 mm, 3-lobed, the lateral lobes short-ovate, ascending, the terminal one triangular, notched at the summit; spur much shorter than the lip.


Flowers June to July

Wetland Indicator: OBL

A form with splotchy lines on the lip rather than spots has been called forma lineata. Both forms can be found in a given population.


Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY




© Michael Hough 2018