|1.||any terrestrial orchid of the genus Listera, having a basal pair of oval unstalked leaves arranged opposite each other|
|2.||any of various other orchids with paired basal leaves|
|[C16: translation of Medieval Latin bifolium having two leaves, from obsolete tway|
any member of either of two genera of orchids, family Orchidaceae: Liparis and Listera. Liparis, also known as false twayblade, with about 320 species, is distributed worldwide. Each plant has broad, paired leaves, and most have dull-coloured, purplish flowers borne in a terminal spike. The flowers of the large twayblade (Liparis lilifolia) of eastern North America have thin, slender side petals and a broad lip. The fen orchid (Liparis loeselii) is a similar species found in northern Eurasia.
Learn more about twayblade with a free trial on Britannica.com.