Phlox pilosa (Prairie Phlox) reaches about two feet high and begins blooming in May. Through evolution, they are perfectly paired for butterflies. The petals have developed a tailored landing pad and the long tubular flower is perfectly designed for the long proboscis of the butterfly. Cool!!! They are quite striking too with varying colors from white to a deep purple.
Frequently Asked Questions
Photo 1 By: Bouba [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/)], via Wikimedia Commons