Figure 5 . Boundary layer conductance to heat (g bh), inferred from time constants for leaf cooling, for bald vs. hairy patches on the same leaf (MAGR, OLEU and PLOC) or on different leaves (POTO, SOLY); in each case, the bald and hairy patches were at equal distances from the leading edge of the leaf and were measured simultaneously. Colors indicate species; small symbols represent results from individual cooling curves, and large semi-transparent symbols represent grand means within each species.