Ultramafic rocks and derived soils (serpentines) are widespread in Turkey, making this one of the most significant countries in the world for serpentine soils and their associated floras. In northwestern Turkey considerable serpentine areas occur in Kütahya, Balıkesir and Bursa provinces, with smaller areas in Çanakkale province. In the Mediterranean region, serpentines extend from Muğla to Hatay provinces, and are scattered northeastwards from Kahramanmaraş to Erzincan provinces. Other notable smaller outcrops occur in Ankara province. Serpentine areas are rich places for plant diversity and local endemism. Many endemics in Turkey are restricted to serpentine soils; some of these are known from only one or two provinces, such as Alyssum crenulatum Boiss., A. dubertretii Gomb., Bornmuellera kiyakii Aytaç & Aksoy and Centaurea aladaghensis Wagenitz. The nickel-accumulating serpentine species in Turkey belong to the genera Alyssum L., Bornmuellera Hausskn., Pseudosempervivum (Boiss.) Grossh. (formerly in Cochlearia L.), Thlaspi L. s.l. and Centaurea L. The present authors have explored 55 serpentine sites; 60 Ni-accumulating and more than 40 serpentine-endemic species have been reported from Turkish serpentines. Ni accumulators and serpentine endemics are evaluated here according to their geographic distributions, altitudes, threat categories and Ni concentrations, and are presented in their grid squares and provinces.