My first birding outing of the spring, enjoying an early-morning walk through deserted woods, I had stepped off the trail for reasons best left unmentioned (but perhaps related to the excessive caffeine consumption required to awaken with the *$&!# birds), when I discovered a patch of Cinquefoil. Every single leaf tooth had a droplet collected at its tip. Everything else in the woods was dry; this was the only 'dew' anywhere. The low sun had just started hitting it in places, and hadn't yet evaporated it.
Turns out this is a phenomenon called guttation -- flow of water due to osmotic pressure in the roots at night, when the leaf stomata are closed (preventing the water from flowing via the usual process of transpiration).