Somatic chromosomes at metaphase of Begonia guixiensis and B. longa . A, Microphotograph of B. guixiensis (Peng et al. 20310, 2n = 30); B, Microphotograph of B. longa (Peng et al. 20076, 2n = 30). A’, B’, Somatic chromosomes serially arranged by length and position of centromeres. Scale bars = 2 μm.