Plant material
Eight taxa (six species and two subspecies) of the genus Tulipawere collected from their wild populations in April to May 2017, 2018 and 2019. All Tulip species were collected in Kosovo, exceptTulipa albanica , which was collected in Albania. One unidentified plant specimen of Tulipa sp. (sample T9, Table 1) was obtained from herbarised material provided by the Herbarium of the University Prishtina. Tulipa kosovarica (locations Goriç and Koznik) andT. luanica (locations Pashtrik and Qafë Prush) were collected from two different localities each. Plant specimens were herbarised and part of young leaves were dried in silica gel for DNA extraction. The voucher specimens were deposited at the Herbarium of the University Prishtina, Kosovo and the Emory University Herbarium, Atlanta, USA. Detailed sample information is given in Table 1.
Table 1 . Basic characteristics of the collection sites, voucher information, and GenBank accession numbers of the Tulipaspecimens used for this study