Distribution of the Erigeron acris group in Murmansk Region, Russia A E. acris L. B E. droebachiensis O.F.Müll. C E. uralensis Less. D E. brachycephalus H.Lindb. Origin and residence status: 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.