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Aronia arbutifolia
http://plants.usda.gov/cgi_bin/plant_profile.cgi?symbol=PHPY4
Images and US range of Red Chokeberry, also called Photinia pyrifolia.
Aronia melanocarpa
http://www.mallorn.com/pom/Dec97/
Description and images of Black Chokeberry.
Aronia melanocarpa
http://www.botany.utoronto.ca/courses/BOT307/D_Families/307D2Aronia.html
Images.
Aronia prunifolia
http://www.npwrc.usgs.gov/resource/1999/neflor/species/5/aronprun.htm
Image and description of Purple Chokeberry, also known as Aronia atropurpurea or Photinia floribunda.