I think I finally figured out among which oak species the endemic crocuses C. karduchorum and C. kotschyanus grow. C. karduchorum seems to grow in Quercus petraea ssp. pinnatiloba scrub. Crocus kotschyanus ssp. hakkariensis is not restricted to light oak woodland and oak scrub, but where we found it the dominant oak was Q. libani. Both are deciduous oak species (not surprisingly given the altitude at which we found C. karduchorum, although C. kotschyanus ssp. hakkariensis seems to have a much wider altitudinal range).