It's quite tall- At least it was until recently when it was hit by wind and rain- Now it's all splayed out -- but still very pretty- It's growing in dappled light/shade and has been blooming for weeks-
There is a name-that-plant forum. You would likely get an answer there within an hour.
White sweet clover.....Melilotus alba
Here is a link that might be useful: White sweet clover flower