Lobelia siphilitica
 The Great Blue Lobelia (Lobelia siphilitica) is a species within the Campanulaceae family. It is an herbaceous perennial dicot native to eastern and central Canada and United States. Growing up to three feet tall it lives in zones 4 to 9 in moist to wet soils. It produces a spike of zygomorphic flowers in the late summer.It blooms from August to October.