Data from flowering plants of Cerastium fontanum recorded in 2017 and 2018 in Hengill, a sub-arctic geothermal area in SW-Iceland (64°03’N; 21°18’W, ~360 m.a.s.l.) doi-10-17045-sthlmuni-21360978-0 https://doi.org/10.17045/STHLMUNI.21360978 Swedish National Data Service Svensk nationell datatjänst Landing page Data from flowering plants of Cerastium fontanum recorded in 2017 and 2018 in Hengill, a sub-arctic geothermal area in SW-Iceland (64°03’N; 21°18’W, ~360 m.a.s.l.) doi-10-17045-sthlmuni-21360978-0 https://doi.org/10.17045/STHLMUNI.21360978 Valdés, Alicia Swedish National Data Service Svensk nationell datatjänst Landing page This data set includes 2 years of data on flowering phenology and fitness of the perennial herb Cerastium fontanum, as well as temperature data recorded at the location of each plant. The data includes information for 245 flowering individuals in 2017, and for 104 individuals in 2018. Access to data through an external actor. Åtkomst till data via extern aktör.