The flower shape is similar to Lobelia siphilitica, so it could be in Campanulaceae.
Scroll to the bottom of the page where you will see a drawing of Lobelia urens, it shows a flower formation which must be a bud about to open, it looks similar to the one next to the lower flower.
http://luirig.altervista.org/f...
There are inflated seed pods forming further up the stem where the flowers come from the main stem, those lower down have long stems shooting from a leaf base.
Check out Lobelia inflata ..
http://luirig.altervista.org/c...
http://luirig.altervista.org/c...
http://www.mywildflowers.com/d...
I can see the spikes coming from the inflated seed pods ...
http://shootingstarnursery.com...
