![Peter Del Tredici (center), the Arnold Arboretum's senior research scientist, discusses the Stewartia collection, which dates from 1918. “You can come here and see these plants, but you don’t know anything about them. You could hold your cell phone up [to the bar codes on the signs posted by many plants]. But it’s better to have someone tell you,” said Del Tredici.](https://arboretum.harvard.edu/wp-content/uploads/2020/07/treemomb_605main.jpg)
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