| Cephalanthera longifolia |
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| Scientific classification |
| Kingdom: |
Plantae |
| Clade: |
Tracheophytes |
| Clade: |
Angiosperms |
| Clade: |
Monocots |
| Order: |
Asparagales |
| Family: |
Orchidaceae |
| Subfamily: |
Epidendroideae |
| Genus: |
Cephalanthera |
| Species: |
C. longifolia |
| Binomial name |
Cephalanthera longifolia
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| Synonyms |
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- Serapias helleborine var. longifolia L.
- Cephalanthera ensifolia (Sw.) Rich.
- Cephalanthera xiphophyllum Reichenb.
- Epipactis ensifolia F.W. Schmidt
- Epipactis longifolia (L.) All.
- Serapias helleborine subsp. longifolia L.
- Serapias longifolia (L.) L.
- Serapias xiphophyllum Ehrh. ex L.f.
- Helleborine longifolia (L.) Moench
- Epipactis grandiflora (L.) Sm.
- Cymbidium xiphophyllum (Ehrh. ex L.f.) Sw.
- Epipactis xiphophylla (Ehrh. ex L.f.) Sw.
- Serapias pallida Wahlenb.
- Cephalanthera pallens Rich.
- Serapias ensifolia (L.f.) Murray
- Epipactis grandifolia All.
- Cephalanthera acuminata Wall. ex Lindl
- Cephalanthera maravignae Tineo in G.Gussone
- Cephalanthera thomsonii Rchb.f.
- Cephalanthera angustifolia Simonk.
- Limodorum acuminatum (Wall. ex Lindl.) Kuntze
- Cephalanthera mairei Schltr.
- Cephalanthera conferta (B.Baumann & H.Baumann) Kreutz
- Cephalanthera longifolia subsp. conferta B.Baumann & H.Baumann
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Cephalanthera longifolia, the narrow-leaved helleborine, sword-leaved helleborine or long-leaved helleborine, is a rhizomatous herbaceous perennial plant in the family Orchidaceae. It is native to light woodland, and widespread across Europe, Asia and North Africa from Ireland and Morocco to China. This includes the United Kingdom, Iran, Russia, Kazakhstan, Turkey, Algeria, India, Pakistan, Germany, Italy, France, Spain, Portugal and many other countries.