References
Altschul SF, Gish W, Miller W, Myers EW, Lipman DJ. Basic local alignment search tool. Journal of Molecular Biology. 1990: 215: 403–410.
Beaulieu JM, Moles AT, Leitch IJ, Bennett MD, Dickie JB, Knight CA, et al. Correlated evolution of genome size and seed mass. 2005;422–37.
Booy G, Raamsdonk LWD Van. Variation in the enzyme esterase within and between Tulipa species ; usefulness for the analysis of genetic relationships at different taxonomical levels. Biochem Syst Ecol. 1998;26(2):199-224
Bornnullejr J. Über eine neue Tulpe der Flora Mazedoniens. Feddes Repert. 1923; 19:199—200.
Christenhusz MJM, Govaerts R, David JC, Hall T, Borland K, Roberts PS, et al. Tiptoe through the tulips - cultural history, molecular phylogenetics and classification of Tulipa (Liliaceae). Bot J Linn Soc. 2013; 172(3):280–328.
Eker I Il, Babaç MTI, Koyuncu M. Revision of the genus Tulipa L. (Liliaceae) in Turkey. Vol. 157, Phytotaxa. 2014. 1–112 p.
Fay MF, Chase MW, Rønsted N, Devey DS, Pillon… Y. Phylogenetics of Liliales: summarized evidence from combined analyses of five plastid and one mitochondrial loci. Aliso [Internet]. 2006;22(November 2015):559–65.
Govaerts R. World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew [Internet]. Access. 2019 [cited 2019 Aug 13]. Available from: http://wcsp.science.kew.org/qsearch.do
Govaerts, R., Dransfield, J., Zona, S., Hodel, D.R. & Henderson, A. World Checklist of Arecaceae. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; http://wcsp.science.kew.org/ Retrieved 13 August 2019.
Hayek A. Prodromus Florae peninsulae Balcanicae, Band 3 (Monocotyledoneae). Repertorium specierum Novarum Regni Vegetabilis, 1933; 30:472
Jakob SS, Meister A, Blattner FR. The Considerable Genome Size Variation of Hordeum Species ( Poaceae ) Is Linked to Phylogeny, Life Form , Ecology , and Speciation Rates. Mol Biol Evol. 2004;  21 (5), 860-9
Kress WJ. Plant DNA barcodes: Applications today and in the future. J Syst Evol. 2017; 55(4):291–307.
Kumar S., Stecher G., Li M., Knyaz C., and Tamura K. MEGA X: Molecular Evolutionary Genetics Analysis across computing platforms. Molecular Biology and Evolution. 2018. 35:1547-1549.
Mayer Ernest, Micevski K. Zur Taxonomie und Chorologie von Tulipa scardica  Bornm. Feddes Repertorium. 1970; 591–8.
Millaku F, Elezaj I. Tulipa luanica ( Liliaceae ), a New Species from Southern Kosovo . Ann Bot Fenn. 2015;52(5–6):315–20.
Millaku F, Elezaj ISA, Berisha N. Sympatric area and ecology of someTulipa species in the west Balkan Peninsula. Thaiszia J Bot. 2018;28(1):35–47.
Obermayer R, Greilhuber J. Does genome size in Dasypyrum villosum vary with fruit colour? Hredity (Edinb), 2005:91–5.
Osmani M. Disa adaptime citogjenetike dhe biokimike të tre llojeve të gjinisë Tulipa (T. albanica, T. kosovarica dhe T. luanica ) në habitatet e tyre natyrore. PhD dissertation. University of Prishtina; 2018.
Pavlovic, Z. Karakteristicni elementi serpentinske flore Srbije. Glasn. Prir. Muz. Beogradu, 1962; 8: 3-20.
Peterson A, Levichev IG, Peterson J. Systematics of Gagea andLloydia (Liliaceae) and infrageneric classification of Gagea based on molecular and morphological data. Mol Phylogenet Evol. 2008; 46(2):446–65.
Raamsdonk LWD Van, Vries T DE. Species relationships and taxonomy inTulipa subg . Tulipa ( Liliaceae ). 1995;195:13–44.
Sang T, Crawford DJ, Stuessy TF. Chloroplast DNA Phylogeny, Reticulate Evolution, and Biogeography of Paeonia (Paeoniaceae). Am J Bot. 1997; 84 (9),1120–36.
Shuka L, Tan K, Siljak-Yakovlev S. Tulipa albanica (Liliaceae), a new species from northeastern Albania. Phytotaxa. 2010;10(1):17.
Shuka Lulëzim, Tan Kit KE. Tulipa kosovarica (Liliaceae), a new species of tulip from Kosovo. Phytotaxa. 2012; 9:1–9.
Swofford, D. L. PAUP*. Phylogenetic Analysis Using Parsimony (*and Other Methods). 2002. Version 4. Sinauer Associates, Sunderland, Massachusetts.
Taberlet P., Gielly L., Pautou G., Bouvet J. Universal primers for amplification of three non-coding regions of chloroplast DNA. Plant Molecular Biology 1991; 17:1105–1109.
Tatic B, Krivosej Z. Tulipa serbica (Liliaceae), a new species from Serbia. Bocconea. 1997;5(2):733–6.
The Plant List. Choice Rev Online. 2013; [cited 2019 Aug 15]. Available from: http://www.theplantlist.org/.
Turktas M, Metin ÖK, Baştuǧ B, Ertuǧrul F, Saraç YI, Kaya E. Molecular phylogenetic analysis of Tulipa (Liliaceae) based on noncoding plastid and nuclear DNA sequences with an emphasis on Turkey. Bot J Linn Soc. 2013; 172(3):270–9.
Tutin TG, Heywood VH, Burges NA, Valentine DH. Flora Europaea. Flora Europaea. 1980. 381–382 p.
Veldkamp JF, Zonneveld BJM. The infrageneric nomenclature ofTulipa (Liliaceae). Plant Syst Evol. 2012; 298(1):87–92.
White T. J., Bruns T. D., Lee S. B., Taylor J. W. 1990. Amplification and direct sequencing of fungal ribosomal RNA genes for phylogenetics.In M. A. Innis, D. H. Gelfand, J. J. Sninsky, and T. J. White [eds.], PCR protocols: A guide to methods and applications, 315–322. Academic Press, San Diego, California, USA.
Yanagisawa R, Kuhara T, Nishikawa T, Sochacki D, Marasek-Ciolakowska A, Okazaki K. Phylogenetic analysis of wild and garden tulips using sequences of chloroplast DNA. Acta Hortic. 2012; 953:103–10.
Zonneveld BJM, de Groot JJ. Tulipa kolbintsevii Zonn., a new species from Eastern Kazakhstan. Plant Syst Evol. 2012; 298(7):1293–6.
Zonneveld BJM. The systematic value of nuclear genome size for “ all ” species of Tulipa L . ( Liliaceae ). Plant Syst Evol. 2009; 281(1):217-245
Zonneveld BJM. The systematic value of nuclear genome size for “all” species of Tulipa L. (Liliaceae). Plant Syst Evol. 2009; 281(1–2):217–45.
Table 1 . Basic characteristics of the collection sites, voucher information, and GenBank accession numbers of the Tulipa samples used for this study