Habenaria obtusata Small Orchis.
Habenaria hyperborea Leafy Orchis.
Habenaria orbiculata Round-leaved Orchis.
Habenaria striata Green Orchis.
Habenaria dilatata White Bog Orchis.
Habenaria leucostachys Giant Orchis.
Orchis rotundifolia Fly-spotted Orchis.
Cypripedium passerinum White Lady's Slipper.
Cypripedium montanum Mountain Lady's Slipper.
Cypripedium acaule Pink Lady's Slipper.
Cypripedium pubescens Large Yellow Lady's Slipper
Cypripedium parviflorum Small Yellow Lady's Slipper
Some of the orchids are quite common in the Rocky Mountains, such, for instance, as the lovely Calypso (Calypso borealis) whose large rose-pink sacs, striped with a deeper hue and variegated by yellow spots, form clumps of exquisite color in the deep green forests.
A very interesting and leatless plant is the Early Coral-root (Corallorhiza innata) found in quantities in the vicinity of Banff, where numbers of its queer, purplish-green flowers spring on succulent stems from the coralloid roots. Other species found in the Selkirk Mountains are: Large Coral-root (Corallorhiza multiflora) and Alpine Coral-root (Corallorhiza stricta) the latter being a very rare plant.
The healthy green Tway Blades (Listera cordata, Listera convallarioides, and Listera borealis) together with the Rattlesnake Plantains (Goodyera menziesii and Goodyera repens) the two latter having peculiar white-veined leaves, are all found in the mountain regions, but are comparatively unattractive plants.
Ladies' Tresses (Spiranthes Romanzofiana) is a lovely member of the Orchid family found blooming towards the close of the summer in marshy localities, where its dense snowy flower-spikes exhale a fragrant perfume.
