Pollination and Plant Families http://biology.clc.uc.edu/courses/bio106/pollinat.htm
Ecological Topics: Plant Features Used By Pollinators http://www.nbii.gov/portal/community/Communities/Ecological_Topics/Pollinators/Learn_About_Pollination/Plant_Features_Used_By_Pollinators
Ecological Topics: Pollination (why it's important to Angiosperms) http://www.nbii.gov/portal/community/Communities/Ecological_Topics/Pollinators/Learn_About_Pollination