Plant identity, anyone?

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This plant decided to make it's home in my front bed. I've done some searching, but haven't found a satisfactory look-a-like. It's almost 6' tall now. I think I like it and want to move it elsewhere, but first I'd like to know what it is.
q plant identity anyone
6' and growing
q plant identity anyone
the stem is very thick and not round, but not square either (at first I thought it was in the mint family because the stems looked more square)
q plant identity anyone
leaves are smooth edged and somewhat glossy
q plant identity anyone
flower is "spear" shaped; this is the largest I've seen the flower so far
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