FIGURE 1.

Introduction history, route, and cultivation distribution of Cydonia oblonga in China. Black arrows show the introduction routes. The numbers in brackets indicate the historical time of introduction in different regions. Colored patches indicate the counties where C. oblonga has been introduced in China. Yellow, green, and blue patches represent the counties with a few individuals introduced by arboretums and universities, C. oblonga plantations, and naturalized populations, respectively.