Dactylorhiza majalis subspecies occidentalis (Pugsley) P. Delforge Synonym of Dactylorhiza kerryensis (Wilmott) P.F. Hunt & Summerhayes. See Kew World Checklist and [1]
Distribution. Western, Northern and Central Ireland Map[1]
Gymnadenia densiflora (Wahlenb.) A. Dietr. = Gymnadenia × densiflora (Wahlenb.) A.Dietr., Allg. Gartenzeitung 7: 170 (1839) only this hybrid name is accepted. Hybrid Formula: G. conopsea × G. odoratissima
^ abcdefghijklmnopqrstuvwxyScannell, M.J.P. & Synnott, D.M. ,1987. Census catalogue of the flora of Ireland. A list of Pteridophyta, Gymnospermae and Angiospermae including all the native plants and established aliens known to occur in Ireland with the distribution of each species, and recommended Irish and English names pp. [i]-xxvii, 1-171, Map. Dublin: Stationery Office
^Webb, D.A. & Scannell, M.J.P., 1983. Flora of Connemara and the Burren. pp. i-xlv, 1-322, 4 colour pls; 25 black and white illustrations. Dublin & Cambridge: Royal Dublin Society & Cambridge University Press.
Bateman, R.M., Pridgeon, A.M. & Chase, M.W. (1997). Phylogenetics of subtribe Orchidinae (Orchidoideae, Orchidaceae) based on nuclear its sequences. 2. Infrageneric relationships and reclassification to achieve monophyly of Orchis sensu stricto. Lindleyana 12: 113-141.
Bateman, Richard M, 2011 Glacial progress: do we finally understand thenarrow-leaved marsh-orchids? New Journal of Botany Volume 1, Number 1, June 2011, pp. 2–15(14) pdf
O'Reilly, P. & Parker, S. (2007). The first nature guide to wild orchids in the Burren. pp. [1]-67. Lladdysul: First Nature.
Scannell, M.J.P. & Synnott, D.M. (1987). Census catalogue of the flora of Ireland. A list of Pteridophyta, Gymnospermae and Angiospermae including all the native plants and established aliens known to occur in Ireland with the distribution of each species, and recommended Irish and English names. pp. [i]-xxvii, 1-171, Map. Dublin: Stationery Office.
Sayers, B. & Sex, S. (2008). Ireland's wild orchids a field guide. pp. [i-iii], i-x, 1-109. Galway: Propeller.
Kingston, N.. (2009). Checklist of protected & rare species in Ireland. pp. 1–15.
Turner Ettlinger, D.M. (1976). British and Irish orchids a field guide. pp. [i]-vi, 1-141. London & Basignstoke: The Macmillan Press Ltd. ISBN0333182626
Webb, D.A. & Scannell, M.J.P. (1983). Flora of Connemara and the Burren. pp. i-xlv, 1-322, 4 colour pls; 25 black and white illustrations. Dublin & Cambridge: Royal Dublin Society & Cambridge University Press.
Harrap, Anne & Simon Harrap (2009) Orchids of Britain & Ireland: A Field and Site Guide, 2nd ed., A & C Black, London. ISBN978-1-4081-0571-9.
Lang, David (1980) Orchids of Britain: a field guide. Oxford University Press ISBN0192176927
Pierre Delforge, 2006 Orchids of Europe, North Africa and the Middle East Portland, Or. : Timber Press 3rd Edition ISBN9780881927542
Karl-Peter Buttler, 1986 Orchideen, die wildwachsenden Arten Europas. Mosaik Verlag ISBN3-570-04403-3
H. Baumann, S. Künkele, 1982 Die wildwachsenden Orchideen Europas. Frankh ISBN3-440-05068-8
Robert L. Dressler,1996 Die Orchideen - Biologie und Systematik der Orchidaceae.
Hans Sundermann, 1975 Europäische und mediterrane Orchideen. Brücke-Verlag, 2. Auflage ISBN3-871-05010-5
J. G. Williams, Orchideen Europas mit Nordafrika und Kleinasien. BLV Verlag, ISBN3-405-11901-4
Kreutz, C.A.J., 2004 Kompendium der Europäischen Orchideen Landgraaf Kreutz ISBN908066264X Lists all subspecies, forma and other names.
Preston C. D., Pearman D. A. and Dines T.D., 2002 New Atlas of the British & Irish Flora Oxford University Press ISBN0-19-851067-5 Verified and standardised maps.