OK, this pretty flowering plant baffles us - although it's growing in a pot in our yard, which makes us highly suspect that we must have bought and planted it. For the last year it's been a leggy green beast - maybe five or six feet high, thirsty, and anonymous. And now, it's burst into these blooms, which are thinly reminiscent of wisteria in how they gather right at the end of branches - but the flowers are a quite different shape. I'm sure it's something quite obvious, but help, please??