21. Chromosome Number:
When they have been reported (i.e., published), chromosome numbers should be included at the end of the entry for taxa at the specific and infraspecific levels, and an "@" sign will follow the chromosome number if from Chinese material (see paragraph 12.17). All chromosome numbers will be cited as the somatic number (e.g., "2n = 14" and "2n = 36@"). Unpublished chromosome numbers will not be included.