Figure 1From: Transcriptomic analysis of a psammophyte food crop, sand rice (Agriophyllum squarrosum) and identification of candidate genes essential for sand dune adaptationDistribution of Sand rice in northern China. The map was carried out based on altitude by ArcGIS software (http://www.esri.com/software/arcgis/). Red dots represented our sampling sites during wild survey. The latitude and longitude of each dot were listed in Additional file 1.Back to article page