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osage orange trees that have dropped their fruit. Although not an uncommon tree, we'd never noticed one or seen its distinctive fruit before. Not related to citrus trees at all, the osage orange is named so because of the pleasant citrusy smell of its fruit. They aren't edible are said to repel ants and look good in a bowl with gourds.
geocaches set up on the route. Sure enough, a check of the smartphone there were 3 to find which kept the kids going, even running, during the hike.
Read House and the other historical sites. There is a garden tour in the summer that I haven't been to in years...