Not a Pandemonium?

      "Nay Mr. Wilkes!"  It's a Polemonium - BUT - it doesn't half help remembering it's name.
      It's definitely not:-
"Pandemonium (AKA Jacob's Ladder, NO idea why.)
noun
A condition or scene of noisy confusion: synonym: noise.

The great hall or council chamber of demons or evil spirits.

An utterly lawless, riotous place or assemblage." 
T B H, I had no idea of the second definition.
      We got some in the garden years ago.  I've no idea whether by design or it snuck in in a Pot, like the Huge annual Poppies.
     Our "weed" wasn't variegated like this one; I wonder Al would have been Pro, or Con.?