purple plant id

I hope someone can help me id this plant that my mother has.  She bought a 
house with the plant there, and typically the garden does not have anything 
very unusual, but there are so many perennials out there, I just don't know 
what it is!   Here's what I know:
At least 4' tall, in a 3' bunch, and in its height of bloom now.( She's in 
zone 8, OR)
Purple, and I mean like Liatris(Gayfeather)  pinkish-purple.
Flowers in tall spike 6-8" long, tiny 5 petaled and(with yellow ) not wider 
than a centimeter
Leaves are smooth, mid-green; sometimes alternate and sometimes opposite 
No scent to speak of from leaves or flowers
NO runners
stems are green and not particularly square

I have tentatively ruled out Veronicas and definitely not Agastache (because 
of no scent) but I wonder about some  type of Lythrum or Loosestrife?  The 
pictures I've seen of the Loosestrife that is banned for invading our 
wetlands seems too pink and the flowers look to be about an inch wide, and 
stems looked red.  However, this is the closest I've seen.
It's a beautiful plant and I'd really like to know what it is.
Happy Weekend,
Shelly Pavlacky\
Portland, OR

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