Often overlooked, Houstonia purpurea or Summer Bluet is one of the prettiest flowers in our flora. Bluets that bloom in the spring, including Houstonia cerulea, or Quaker Ladies, are such a welcome sight, but not many people know that the Summer Bluet even exists. There are many species of bluets, more than two dozen in North America, according to the Tennessee Native Plant Society. Summer Bluet plants vary from six to 20 inches in height. You need to get down there — and possibly use a hand lens — to fully appreciate these lovelies!