Fig. 1

Reference image of C. macranthos, C. × ventricosum, and C. shanxiense flowering plant. (a) Reference image of C. macranthos; (b) Reference image of C. × ventricosum; (c) Reference image of C. shanxiense. All of the above images were taken by Mr. Baoqiang Zheng. Images a and b were photographed in Sandawan Township, Yanji County, Jilin Province, China (43.2°N, 129.1°E), and image c was taken in the Beijing Songshan Nature Reserve (40.3°N, 115.4°E). All images are unpublished (used with permission).