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Control of the Invasive Exotic Rhamnus cathartica in Temperate North American Prairies.. Page 7 of 11 <br />Figure 5. Stand of mature native tree species with a thick R. cathartica understory. <br />http:// www. hort.agri.umn.edu/h5015 /00papers /gale.htm <br />2/15/01 <br />