Thanks again to David Tarrant for sending along a couple photographs from his local botanical garden in Mexico (I will visit one day, I promise!).
Cardiospermum halicacabum is known commonly as balloon vine, love-in-a-puff or, in Mexico, as frolitos (little lanterns). This woody vine is related to maples, although at first glance it more closely resembles the also-related golden raintree, Koelreuteria paniculata, because of the inflated fruit capsules.
The meaning of love-in-a-puff and the name of the genus, Cardiospermum, are linked. Cardiospermum broken down into its component parts means heart (cardio-) and seed (sperma-). The seeds are not shaped like hearts, but instead have a white heart-shaped pattern on the round and otherwise brown seeds (source with more photographs).
Cardiospermum halicacabum has a pantropical (and subtropical) distribution. For further reading, Cal’s Plant of the Week featured this species a few years ago. Also, more photographs are available via the Image Archive of Central Texas Plants.