Amerorchis rotundifolia (Banks ex Pursh) Hultén
Annotated by L. A. Mehrhoff, 2 Jul 1978.

Montana: Lewis and Clark County: [locality and coordinates withheld; status in Montana: S3 (Rare; MTNHP)],
On moist well drained hummocks and edges of cold, calcareous springs. Under shade of young spruce. Gentle northwest slope (almost flat). Old timber cut with good regrowth.
Associated spp.: Cypripedium passerinum, Platanthera obtusata, Listera borealis, Picea englemannii, Equisetum scirpoides, Equisetum arvense, Mitella nuda, Streptopus amplexifolius, Cornus stolonifera, Linnaea borealis, Salix spp.
Common -- in the specific habitat. Phenology: Flowers.

L. A. Mehrhoff 7848, Jul 2, 1978
MONTU, Accession: 87937