About this Map
This map shows where the plant Cirsium vulgare has been found. When a plant has been collected at a specific place there is a blue dot on the map. When many plants have been collected the color of the dot is made darker, then redder. When there is a record of the plant growing on an island the island is shown in the normal color. Otherwise, the island just gray. The data displayed in this map is incomplete and occasionally contains errors.
Distribution Map License
The map your browser is displaying is licensed. The map is a Stamen terrain map built by visiting maps.stamen.com. It has the following attribution: Map tiles by Stamen Design, under CC BY 3.0. Data by OpenStreetMap, under ODbL.
Data for plant locations comes from many sources listed at this Attribution and Copyright link. This map is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike license.