Thanks to a highly intelligent friend, Simon Butler, who viewed this posting from a link provided on Facebook, this plant has been identified as "Jewelweed" (Impatiens capensis). According to Simon, it's also referred to as "Touch-me-not."
Here are the two hyperlinks he sent with more information:
THANK YOU MOST AWESOME SIMON!
POST AS IT WAS ORIGINALLY WRITTEN:
Faeries must have planted this orange-flowering herbacious bush in my yard. (Sure I understand that plants get distributed by many different means, by birds, insects, the wind, dogs that collect seed in their fur). It's just I've just never seen this variety of plant before -- not anywhere in my neighborhood, or from foraging through the woods -- never even saw it from the past and I spent most of my childhood playing in the woods where I grew up four miles from here. I've also never seen this plant inside any nursery.
This is the SECOND year it's appeared in my yard -- suggesting it's perriannual. It died back last winter and now just sprouted up again (late summer).
Any idea what this plant might be called? (Click any photo to enlarge it.)
Beyond asking that you pay close attention to the interesting nodules that formed where the branches connect to the herbacious stem, see next photo, I'll just let the pictures speak for themselves.