The Persian Silk Tree (Albizia julibrissin) or Mimosa is a Category 1 FLEPPC invasive species that is common throughout North and Central Florida.  It may look pretty, but quickly grows to over 50-feet and is difficult to get rid of once it's established.

Tickseed (Coreopsis sp.) is a common flower along the edges of Freshwater Marshes and in Pine Flatwoods communities throughout Florida.  This genus is a member of the Asteraceae family and is popular with various insects (bees, butterflies, etc). I believe the species pictured below is Leavenworth's Tickseed (Coreopsis leavenworthii, FACW).