Explanation of variables in "Data Experiment" (Experiment with 2 parasites x 25 Hosts x 2 nutrient levels) Parasite: No parasite / Rhinanthus minor / Rhinanthus alectorolophus Host: Host species Nutrients: Low or high nutrient level FunctGroup: Functional group of host (Grass, forb, legume) HNutrientStatus: Nutrient status of host habitat PMass: Mass of parasite (mg) LogPMass: Log10 of parasite mass LeafLength4Weeks: Length of longest leaf of parasite after 4 weeks of growth (mm) Host mass: Mass of host (mg) LogHostMass: Log10 of host mass TotalMass: Total mass per pot (parasite + host) (mg) LogTotalMass: Log10 of total mass per pot DaysToFlowering: Days until parasite flowered InfloLength: Sum of length of all inflorescences (mm) LogInfloLength: Log10 of inflorescence length LengthLongestLeaf: Length of longest leaf of parasite at harvest Height: Height of parasite (mm) LogHeight: Log10 of height HostSeedMass: Mean seed mass of host (mg) LogHostMassNoP: Mean log10 of biomass of host grown without a parasite HostInitialMass: Host mass at time of parasite transplanting (mg) LogHostInitialMass: Log10 initial host mass LogHostSeedMass: Log10 of mean host seed mass RGR: Relative growth rate of host Survived: Whether the parasite survived or not Explanation of variables in "Data Comparison" (Data on performance of parasites with the same hosts in various experiments) Host: Host species LogBiomMinor: Log10 biomass of Rhinanthus minor in current experiment LogBiomAlec: Log10 biomass of Rhinanthus alectorolophus in current experiment LogBiomMelam: Log10 biomass of Melampyrum arvense in study of Matthies (2017) LogBiomS&M: Log10 biomass of Rhinanthus alectorolophus in study of Sandner & Matthies (2018) LogBiomOdontites: Log10 biomass of Odontites vulgaris in study of Geppert (2012)