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Page 6 <br />The plus sign (+) indicates the tree species is native to another continent other than the ones listed in the grouping. <br />Invasive plant species are often characterized by their vigor, ability to adapt, reproductive capacity, and general lack <br />of natural enemies. These abilities enable them to displace native plants and make them a threat to natural areas. <br />Seven of the 246 tree species in City of Pleasanton are identified as invasive on the state invasive species list <br />(California Invasive Species Advisory Committee 2010). These invasive species comprise 0.8 percent of the tree <br />population though they may only cause a minimal level of impact. The three most common invasive species are <br />Chinese tallowtree (0.3 percent of population), California peppertree (0.3 percent), and Blue gum eucalyptus (0.2 <br />percent) (see Appendix V for a complete list of invasive species).