Data from: Geographical variation of Artemisia leaf morphology along a large environmental gradient in China

We collected 60 species of <em>Artemisia</em> from 81 sampling sites in 15 provinces in China from the end of July to August 2018. At each site, we recorded latitude and longitude. Then we identified all<em> Artemisia</em> species and randomly sampled 4 plants for each species. A total of 1,041 plants were sampled. In the laboratory, 10 leaves in the middle of each plant were selected and detached. Because light might have effect on leaf morphology, we only used sun exposed leaves. The leaves were soaked in distilled water for 24 h to fully restore their shapes. After blotted-dried, leaves were place as petiole to the left and tip to the right, and an Epson V370 (Seiko Epson Corp., Nagano, Japan) was used to scan the leaves at a resolution of 600 DPI. We set 40 landmarks along the blade edge on each leaf. The first point was set at the petiole and the 21st point at the tip, and these two points were defined as landmarks. The remaining points were evenly distributed at the blade edge and defined as semilandmarks. Landmarks were saved in tps format using Geomorph package.