Fig. 1From: The phylogeographic structure of Hydrilla verticillata (Hydrocharitaceae) in China and its implications for the biogeographic history of this worldwide-distributed submerged macrophyteSampling sites of Hydrilla populations and geographical distribution of cpDNA haplotypes. a) Sampling sites of 123 Hydrilla populations and geographical distribution of nine haplotypes of trnL-F sequences in China. The numbers 1-9 indicate nine main river basins: the Amur-Heilong River Basin (RB1), the Liao River and Hai River Basin (RB2), the Yellow River Basin (RB3), the Huai River Basin (RB4), the Yangtze River Basin (RB5), river basins in Southeast China (RB6), the Pearl River Basin (RB7), river basins in South China (RB8), and river basins in Southwest China (RB9). b) Haplotype network of the chloroplast trnL-F region. The haplotypes without colour are not found in China. Black dots and short lines represent inferred interior nodes that were absent in the samplesBack to article page