The Eastern Prickly Pear, Opuntia humifusa, is an endangerd plant of southernOntario. We are studying the pollination and reproductive biology of this speciesat Point Pelee National Park. The team, Rosa Aeillo and Peter Kevan at theUniversity of Guelph, and Lovett-Doust at the University of Windsor arecollaborating with personnel from the Natioanl Park.