| Non-native
trees (click on any image for a larger view) |
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 Blue gum Eucalyptus (Eucalyptus globulus), winter, the Presidio 
Tree tobacco (Nicotiana glauca), summer, Hayward
Regional Shoreline Locust (Robinia), spring, Quarry Lakes Regional Recreation Area |
 Acacia (Acacia), winter, the Presidio 
White poplar (Populas alba), summer, Skyline
Ridge Open Space Preserve |
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