Buttonweed or Poorjoe [Diodia teres] photos were taken at Fletcher Park on 11 July 2013. It’s the member of the Madder (Rubiaceae) family. Newcomb’s Wildflower Guide, pages 158-159, states it blooms in summer and fall and can be found in dry sandy soil. USDA Plants Listing: https://plants.usda.gov/home/plantProfile?symbol=DITE2 (Poorjoe)
