A photo or comparison would be helpful. Here is a starting point:
http://www.hear.org/starr/hiplants/i...ticillatus.htm

How does your plant differ from this?

M. Reed

Sam wrote:
It's been growing in a hanging basket in a shady window for about 2
years. Quite bushy. Leaves look similar to those on strawberry
plants. This spring it sprouted flowers - a big surprise. They are
about an inch and a half long and bell shaped. They are white with
purple dots at the opening. They are on a stalk with 3 or 4 around
each position. These positions are spaced about an inch from each
other, along the stalk. I am completely mystified by what this
supermarket bought plant is. There was no identification on the pot.
Thanks for any help here.