Premise of research. Variation in flower color in the human-visible spectrum is well studied but less understood for ultraviolet (UV) floral traits despite their ubiquity and importance in mediating plant-insect interactions. Describing the extent of quantitative phenotypic variation and determining the heritability of UV pattern are crucial for understanding the evolution of flower color. Finally, selection on vegetative biochemical properties can indirectly influence flower color evolution, and thus, establishing correlation between biochemistry and color pattern will inform whether indirect selection could act on flower color patterns.Methodology. We characterize phenotypic variation for the proportion of petal area that absorbs UV (UV proportion) in 13 populations representing two taxa in the Argentina anserina aggregate. We estimate broad-sense heritability and genetic correlations for UV proportion, floral spectral qualities measured at the base and apex of petals (UV reflectance, UV chroma, brightn...