This naturalized biennial (or perennial) is an introduced European garden plant. This erect plant, up to 4 feet tall, has lance-shaped leaves (B) and bluish, purple or white flowers with 4 petals, about 3/4 inches across; they are arranged in terminal clusters (A). Identified by its 4-petaled bluish-purple or white flowers. Three phlox species, Timber Phlox (Phlox divaricata), Fall Phlox (Phlox paniculata) and Prairie Phlox (Phlox pilosa) have similar looking flowers, but they all have 5 petals.
Spreading in woodlands where planted, flowering in May and June, but a few much later. In Fontenelle Forest, common in the woods behind the Visitor s Center. At Neale Woods, uncommon near the bench on MRE Trail.
The sweet fragrance of these flowers is most pronounced at the end of each day.
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