Northwest Twayblade, Northwestern Twayblade, Western Twayblade: Neottia banksiana (Synonyms: Listera banksina, Listera caurina, Listera retusa, Neottia caurina, Ophrys caurina) -
Northern Twayblade: Neottia borealis (Synonyms: Listera borealis, Ophrys borealis) -
Broad-lip Twayblade, Broad-lipped Twayblade, Broadleaf Twayblade: Neottia convallarioides (Synonyms: Bifolium convallarioides, Diphryllum convallarioides, Epipactis convallarioides, Listera convallarioides, Listera eschscholziana, Ophrys convallarioides) -
Heart-leaf Twayblade, Western Heart-leaved Twayblade: Neottia cordata (Synonyms: Bifolium cordatum, Diphryllum cordatum, Distomaea cordata, Listera cordata, Listera cordata var. cordata, Listera cordata var. nephrophylla, Ophrys cordata, Pollinirhiza cordata) -