Figure 1.

Diurnal water vapor gas exchange of Southern magnolia tepals and leaves over 2 d of anthesis and microclimate conditions. A, g_s of tepals (first whorl, black triangles; third whorl, black inverted triangles) and leaves (white circles). B, E rates of tepals and leaves (same symbols as in A). C, Microclimatic variables of air temperature (black circles) and air vapor pressure deficit (white circles) averaged over the measurements in A and B. Sample sizes can be found in “Materials and Methods.” Error bars denote sd. Time point abbreviations are as follows: Pd, predawn; M, morning; Md, midday; A, afternoon; N, night.