Cypripedium passerinum Rich.s.
Annotated by L. A. Mehrhoff, 2 Jul 1978.

Montana: Lewis and Clark County: [locality and coordinates withheld; status in Montana: S2S3 (Rare; MTNHP)],
On moist, well drained hummock and edge of cold, calcareous spring. Under shade of young spruce. Gentle Northwest slope (almost flat). old timber cut with good regrowth.
Associated spp: Picea englemannii, Amerorchis rotundifolia, Platanthera obtusata, Listera borealis, Equisetum scirpoides, Equisetum arvense, Mitella nuda, Streptopus amplexifolius, Cornus stononifera, Linnaea borealis, Salix spp.
Extremely rare: 32 plants Orchids of Montana Phenology: Flowers.

L. A. Mehrhoff 7845, Jul 2, 1978
MONTU, Accession: 81230