Neottia banksiana is a species of orchid known by the common name northwestern twayblade. There are also many species of flora including the uncommon sanicle and twayblade. It has been introduced into Ontario, Canada, where it has been called the eggleaf twayblade. In some of the dune slacks there are populations of marsh orchid and common twayblade. Orchids that grow here include common spotted orchid, bee orchid and twayblade. Lesser twayblade ("Listera cordata") is found in association with old collapsing heather bushes. Various colour-forms of greater knapweed may be found as well as common twayblade. Twayblade is an old English word meaning two-leaf.