A closer look at leaves
Figure 2. Close-up of a lotus leaf, an example of a super-hydrophobic plant. The roughness of the leaf surface results from the coexistence of bumps about 10 µm wide and hollow channels of about 1 µm in diameter. The entire surface is covered by a layer of wax that makes it hydrophobic. The ability of the leaf to repel water is enhanced by the surface roughness. (Picture credit: W Barthlott)