twayblade : Idioms & Phrases
broad-leaved twayblade
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noun small orchid with two elliptic leaves and a slender raceme of small green flowers; western North America
Listera convallarioides.
WordNet
lesser twayblade
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noun orchid having two triangular leaves and a short lax raceme of green to rust-colored flowers with the lip flushed mauve; Europe and Asia and North America and Greenland
Listera cordata.