You might recognize this, but when I saw it I stopped in my tracks like Boz does when there's something he must smell.
When I got home I searched for it on the web. It's Passiflora incarnata, otherwise known as Purple passionflower. It's easy to see why it got its name; it's beautiful enough to fall in love with.
This plant was growing around the base of a palm tree on a residential street. I want some in my yard. A site called Dave's Garden says Purple passionflower is "wild, invasive and virtually indestructible." That would be fine, the yard needs some work.
Wikipedia says the plant is used to treat anxiety and sleeplessness. I'm off to buy some today. Yesterday I invited a few friends to join me for tea at a place we hadn't tried, and...well read about it at Miss Havisham's place if you can bear it.