twayblade

twayblade

[twey-bleyd]
noun
any of various orchids, especially of the genera Listera and Liparis, characterized by two nearly opposite broad leaves.

Origin:
1570–80; dial. tway (apocopated form of Old English twēgen twain) + blade

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World English Dictionary
twayblade (ˈtweɪˌbleɪd)
 
n
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 twaytwo + blade]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

twayblade

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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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