About this Map
This map shows where the plant Pterocactus hickenii 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 in a district the district is shown in the normal color. Otherwise, the district has a white overlay.
Distribution Map License
The map your browser is displaying is composed of two parts. Each part is licensed. The background 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.
Displayed over the terrain map is a partially transparent overlay that shows where the species has been found. This overlay uses data from many sources listed at this Attribution and Copyright link. This overlay is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike license.