Supplementary Data 6: Corolla measurements of flower specimens from Myanmar amber

Definitions: The flower diameter denotes the greatest width across the calyx. The depth of cup, denote the vertical distance from upper edge to the bottom of the flower cup. The diameter of the cup is the maximum distance across the corolla before the petals become separate. The sepal length is the mean distance from the tip of each sepal to the central where the sepal separates from the corolla or cup. The symbol "‒" designates an incomplete or unknown value.Sepal lengths are given as successive measures of each of the five measurable sepals for each pentamerous flower.Measurements are given in millimeters.