The distributional range of each species is drawn based on the records by Luo et al. [8,9] and herbarium specimens (http://www.cvh.ac.cn/). The a-f refer to these species and their distribution. Photos of the eight Fritillaria species studied are also added: a. F. cirrhosa; b. F. przewalskii; c. F. taipaiensis; d. F. unibracteata; e. F. delavayi; f. F. thunbergii; g. F. pallidiflora; h. F. ussuriensis.</p