Epipactis helleborine subsp. densifolia (W.Hahn, Passin & R.Wegener) Kreutz
First published in Eurorchis 17: 105 (2005)
- Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.
Not accepted by
- Kühn, R., Pedersen, H.Æ. & Cribb, v (2019). Field Guide to the Orchids of Europe and the Mediterranean: 1-430. Kew Publishing, England. [Cited as Epipactis helleborine subsp. tremolsii.]
Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
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