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The flower structure of the Phlox genus is a classical example of a butterfly flower. Such flowers feature flared petals that function as a landing pad for these insects, and a long narrow tube that is accessible to the long proboscis of butterflies, as well as skippers and moths. Such flowers typically occur in loose, rounded clusters, and are often fragrant. The flowers of Prairie Phlox have all of these characteristics. A very rare variety of Prairie Phlox that occurs within the Sangamon river basin in Sangamon and Champaign counties is Phlox pilosa var. sangamonensis (Sangamon Phlox). It is distinguished primarily by its hairless stems, flowering stalks, and leaves, and is listed as an endangered species in the state of Illinois. Return