
1) Listera ovata 2) Orchid 3) Orchidaceous plant
Found on
https://www.crosswordclues.com/clue/twayblade

• (n.) Any one of several orchidaceous plants which have only two leaves, as the species of Listera and of Liparis.
Found on
http://thinkexist.com/dictionary/meaning/twayblade/

any member of either of two genera of orchids, family Orchidaceae: Liparis and Listera. Liparis, also known as false twayblade, with about 200 ...
Found on
http://www.britannica.com/eb/a-z/t/96

Twayblade (Listera ovata) is a perennial herb of the natural order Orchidaceae, native to Europe and Siberia. It has fleshy roots without tubers and two large, broadly elliptic leaves. The stem ends in a very long spray of small, yellow-green flowers with a long, narrow lip ending in two lobes.
Found on
http://www.probertencyclopaedia.com/browse/BT.HTM

[
n] - orchid having a pair of ovate leaves and a long slender raceme of green flowers sometimes tinged red-brown 2. [n] - an orchid of the genus Liparis having a pair of leaves
Found on
http://www.webdictionary.co.uk/definition.php?query=twayblade
noun orchid having a pair of ovate leaves and a long slender raceme of green flowers sometimes tinged red-brown; Europe to central Asia
Found on
https://www.encyclo.co.uk/local/20974

any of various orchids, esp. of the genera Listera and Liparis, characterized by two nearly opposite broad leaves.
Found on
https://www.infoplease.com/dictionary/twayblade
No exact match found.