Fig. 1

Pictures of inflorescence and somatic chromosomes of three varieties of Bidens pilosa in Taiwan. Representatives of inflorescence of var. minor (a), var. pilosa (d) and var. radiata (g) and somatic chromosomes of roots sampled from two different populations of each variety: var. minor from Chiayi (2n = 72) (b) and from Yilan (2n = 72) (c), var. pilosa from Hualien (2n = 72) (e) and from Chiayi (2n = 72) (f) and var. radiata from Nantou (2n = 48) (h) and from Yilan (2n = 48) (i) county in Taiwan