Black Hills orchids

Scientific Name	Common Name(s)	Black Hills Distribution by County	Flowering Period

1. Calypso bulbosa var. americana	Fairy slipper, Venus slipper	Lawrence	late May - late June
2. Coeloglossum viride	Long-bracted orchid	Lawrence, Custer, Pennington	late May - July
3. Corallorhiza maculata	Spotted coralroot	Lawrence	May - July
4. Corallorhiza odontorhiza	Late coralroot	Lawrence	August - September
5. Corallorhiza striata var. striata Corallorhiza striata var. vreelandii	Striped coralroot Vreeland’s striped coralroot	Lawrence, Meade, Pennington, Custer Lawrence, Meade	June - July
6. Corallorhiza trifida	Pale coralroot	Lawrence	early June - August
7. Corallorhiza wisteriana	Wister’s coralroot	Lawrence, Meade	late May - July
8. Cypripedium parviflorum	Yellow ladyslipper	Lawrence, Meade, Pennington	late May - mid June
9. Epipactis gigantea	Giant helleborine	Fall River	late June - August
10. Goodyera oblongifolia	Giant rattlesnake plantain	Lawrence	July - August
11. Goodyera repens	Lesser rattlesnake plantain	Lawrence, Pennington, Custer	July - August
12. Listera convallarioides	Nuttal’s twayblade	Lawrence	June
13. Piperia unalascensis	Alaska orchid	Lawrence	July - August
14. Platanthera aquilonis	Northern bog orchid	Lawrence	July - August
15. Platanthera dilatata	White bog orchid	Lawrence	June - July
16. Platanthera huronensis	Huron bog orchid	Lawrence	July - August
17. Platanthera orbiculata	Round-leaved orchid	Lawrence	August
18. Spiranthes romanzoffiana	Hooded ladies tresses	Lawrence	late July - August