Easily mistaken for : Lesser Butterfly Orchid (Platanthera bifolia) but that has the two pollinia closer together and parallel to each other rather than splayed out sideways.

Confusion: Aberrant flowers of Greater Butterfly Orchid are fairly frequent, some lacking both spur and tongue, others without lateral sepals but with a sepal-like tongue. Yet others have a spur but no tongue. Sometimes all three sepals resemble tongues. Peloric aberrations have also been recorded where the normal zygomorphic symmetry is broken by the addition of other elements so as to resemble actinomorphic symmetry. However, all Orchids nominally possess zygomorphic symmetry (bi-lateral symmetry).

Hybridises with : Lesser Butterfly Orchid (Platanthera bifolia) to produce Platanthera × hybrida

No relation to : Butterfly Bush, Alternate-leaved Butterfly-bush, and Weyer's Butterfly-Bush and [a plant with similar name].

Habitat: Woods, but in the north also grassland, usually on alkaline soils.

Smells strongly sweet, particularly at night. It is pollinated by moths, in particular the Silver-Y Moth and the Small Elephant Wawk-moth, seting seed in 70% to 90% of the capsules.

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