Spiranthes cernua

Nodding lady's tresses
Spiranthes cernua flower
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Monocots
Order:	Asparagales
Family:	Orchidaceae
Genus:	Spiranthes
Species:	S. cernua
Binomial name
Spiranthes cernua (L.) Rich.
Synonyms
Ophrys cernua L. (basionym) Limodorum autumnale Walter Spiranthes annua Lesq. ex Brandeger & Coville Neottia cernua (L.) Sw. Gyrostachys cernua (L.) Kuntze Gyrostachys constricta Small Spiranthes constricta (Small) K.Schum. Ibidium cernuum (L.) Bouse Triorchis cernua (L.) Nieuwl.

Spiranthes cernua, commonly called the nodding lady's tresses, is a species of orchid occurring from Eastern Canada to the central and eastern United States.

A commonly cultivated variety is Spiranthes cernua var. odorata 'Chadds Ford', grown because of its larger flowers, ease of cultivation, and other merits.

As the common name suggests cernua means "falling over," or "bowed" in Latin.

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Wikipedia