Fig. 2

A demonstration of measurements collected from the water bath protocol. Paired photographs (a, c, e) and thermographs are given (b, d, f) for: a and b Campanula (individual 13 at set bath temperature of 35 °C); c, d Leucanthemum vulgare (individual 3 at set bath temperature of 45 °C); and e, f Eschscholzia californica (individual 3 at set bath temperature of 45 °C). On each thermograph four point measurements are taken. ‘sp1*’ measures water temperature, the ‘*’ indicates it has separate parameters (pertaining to water emissivity, described in main text) from other point measurements. ‘sp2’, ‘sp3’ and ‘sp4’ measure the apparent temperature of the petal edge, reproductive structures and petal base respectively. For each thermograph the temperature value measured by each point is given in the top left of each image. Apparent temperature is indicated in thermographs via the colour scale to the right of each thermograph. In thermal images all values are in Kelvin