Aronia arbutifolia
   Images and US range of Red Chokeberry, also called Photinia pyrifolia.
   http://plants.usda.gov/java/profile?symbol=PHPY4

Aronia melanocarpa
   Images.
   http://www.botany.utoronto.ca/courses/BOT307/D_Families/307D2Aronia.html

Aronia prunifolia
   Image and description of Purple Chokeberry, also known as Aronia atropurpurea or Photinia floribunda.
   http://www.npwrc.usgs.gov/resource/plants/florane/species/5/aronprun.htm