What plant is that?

Click on photo below to view larger image
Purple Leaved Willow HerbPurple Leaved Willow Herb plantPurple Leaved Willow Herb dried seed headEpilobium coloratum coma
Upper left photo credit: © Francis R. Underwood 2019
Upper right and lower left photo:
©David G. Smith, http://www.delawarewildflowers.org
Lower right photo: G. D. Bebeau

The mystery plant for March 2019 is a perennial with opposite, sharply toothed leaves which can grow to 3 feet tall.  The flowers have 4 petals and are white to pink in color.  As the flowers mature the calyx elongates into a long tube with the corolla at the tip. As the seeds form they produce long hairs at the apex.  These hairs are known as the coma and are similar to the coma found on Milkweed seeds.    The coma aids the seeds in dispersal by the wind.  This plant blooms from late July through August and is often found in moist areas.

It’s. . .

Botanical Name:
Epilobium coloratum
Common Name:
  Purple Leaved Willow Herb
  Onagraceae (Evening Primrose Family)
  Borders of streams and ponds in moist soil