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Richness (total number of compounds) of secondary metabolite classes by species and leaf age. Compounds that were detected in all treatments for a species–leaf age group, which represent the majority of compounds in all cases, are coded as ‘all treatments’. Compounds that were only detected in a given treatment are coded as such. The two USUV treatments are grouped together as no compounds were detected in only one of these treatments. (This figure is available in colour at JXB online.)
