Distribution of the Erigeron acris group in Murmansk Region, Russia A E. politus F. B E. × pilosiusculus Sennikov C E. rigidus Fr. D E. × intercalaris Sennikov. Origin and residence status: green – native; yellow – pre-industrial alien; red – industrial alien. Maps were created using ArcGIS software by Esri. ArcGIS is the intellectual property of Esri and is used herein under license. Copyright Esri. All rights reserved.