Tulipa eichleri Regel

POWO follows these authorities in synonymising this name:

• Christenhusz, M.J.M., Govaerts, R., David, J.C., Hall, T., Borland, K., Roberts, P.S., Tuomisto, A., Buerki, S., Chase, M.W. & Fay, M.F. (2013). Tiptoe through the tulips - cultural history, molecular phylogenetics and classification of Tulipa (Liliaceae). Botanical Journal of the Linnean Society 172: 280-328. [Cited as Tulipa undulatifolia.]
• Davis, P.H. (ed.) (1984). Flora of Turkey and the East Aegean Islands 8: 1-632. Edinburgh University Press, Edinburgh. [Cited as Tulipa undulatifolia.]
• Everett, D. (2013). The genus Tulipa Tulips of the world: 1-380. Kew publishing, Kew. [Cited as Tulipa undulatifolia var. undulatifolia.]
• Güner, A. (ed.) (2018). Resimli Türkiye Florası (Illustrated Flora of Turkey) 2: 1-1054. ANG Vakfı. Nezahat Gökyi˘git Botanik Bahçesi, Istambul. [Cited as Tulipa undulatifolia var. undulatifolia.]
• Mabberley, D.J. (1982). William Roxburgh's 'Botanical description of a new species of Swietenia (Mahogany)' and other overlooked binomials in 36 vascular plant families. Taxon 31: 65-73. [Cited as Tulipa persica.]

This name was accepted following an alternative taxonomy by these authorities:

• Czerepanov, S.K. (1995). Vascular Plants of Russia and Adjacent States (The Former USSR): 1-516. Cambridge University Press. [Cited as Tulipa eichleri.]
• Rechinger, K.H., Browicz, K., Persson, K. & Wendelbo, P. (1990). Flora Iranica 165: 1-194. Naturhistorisches Museums Wien. [Cited as Tulipa eichleri.]
• Takhtajan, A.L. (ed.) (2006). Konspekt Flora Kavkaza 2: 1-466. Editio Universitatis Petropolitanae. [Cited as Tulipa eichleri.]
• Zonneveld, B.J.M. (2009). The systematic value of nuclear genome size for "all" species of Tulipa L. (Liliaceae). Plant Systematics and Evolution 281: 217-245. [Cited as Tulipa eichleri.]
• van Raamsdonk, L.W.D. & de Vries, T. (1995). Species relationships and Taxonomy in Tulipa subg. Tulipa (Liliaceae). Plant Systematics and Evolution 195: 13-44. [Cited as Tulipa eichleri.]