Ha ha hahahaha
*mad scientist-type cackling*
Purslane? Nyet! (but good guess).
It’s an Impatien! Specifically, Impatien repens, common names variously Ceylon Jewelweed, Golden Dragon Impatien, etc. Ours is actually pretty small – can form huge clumps and cascading torrents in warmer zones.
Flower is typical of many members of the genus, and they ALL have the little spur in the rear.
For more weird, wild species impatiens, visit the Cistus Nursery website (I’m pretty sure they used to sell this, but I don’t see it listed currently). We got ours from local plantswoman, gardener, and mail-order-addict Elissa Steeves.
Thanks for playing, all!</d