↑ Castroviejo, S. & al. (eds.) (2005). Flora Iberica 21: 1-366. Real Jardín Botánico, CSIC, Madrid.
↑ Baumann, B. & Baumann, H. (2005). Beiträge zur Kenntnis der Orchideenflora Nordwestafrikas. Journal Europäischer Orchideen 37: 915-938.
↑ Pedersen, H.A. (2006). Systematics and evolution of the Dactylorhiza romana/sambucina polyploid complex (Orchidaceae). Botanical Journal of the Linnean Society 152: 405-434.
↑ Vázquez Pardo, F.M. (2009). Revisión de la familia Orchidaceae en Extremadura (España). Folia Botanica Extremadurensis 3: 1-367.
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