Ontario Lobelia, a native species, has been added to the USWildflowers database (09/05/2015.) Scientific name is Lobelia kalmii. Photo below was taken on a small island in the North Channel of Lake Huron in Ontario, Canada on August 19, 2015. Go to the Ontario Lobelia detail page for more photos and information.
Several years ago the Chattanooga Valley Church of the Nazarene generously opened a walking track next to a creek on their property in Flintstone, Georgia and made it available to the public. My wife and I take advantage of that track from time to time, and have been surprised and pleased by how many wildflowers grow in the area. Yesterday was a beautiful day, so we walked the track, and I went back later to photograph the wildflowers. Here are a dozen native species blooming now along the track.
Among the first wildflowers you notice along the creek is Green-headed Coneflower.