2022 Volume 87 Issue 4 Pages 383-389
Previous chromosome information for the lower chromosome numbers 2n=14, 16, 18, and 20 in Asian Begonia are restricted to nine species in two sections Diploclinium and Platycentrum. Here we report the first chromosome counts of four species as well as reconfirmed chromosome numbers of four species in sect. Platycentrum. We found 2n=12 in B. cathcartii, the lowest chromosome number known for the genus. The number of species with lower chromosome numbers reported is increased to 13 species in sections Diploclinium and Platycentrum. Additionally, we provide the first report of karyotypes of seven species with the lower chromosome numbers in sect. Platycentrum. Based on the present results and previous chromosome reports for a total of 13 species with lower chromosome numbers, the chromosome evolution for them is discussed.
