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This Aug. 1, 2017 photo shows Llewellyn Everage, who directs interns and volunteers at the Audubon Louisiana Nature Center, holding leaves from a Chinese tallow, a highly invasive tree rapidly overtaking forests from Texas to Florida, at the center in New Orleans. The 86-acre site, with walking trails and boardwalks winding through a swampy forest, flooded in 2005 and became overrun with Chinese tallow in the years that followed.(AP Photo/Stacey Plaisance)

This Aug. 1, 2017 photo shows Llewellyn Everage, who directs interns and volunteers at the Audubon Louisiana Nature Center, holding leaves from a Chinese tallow, a highly invasive tree rapidly overtaking forests from Texas to Florida, at the center in New Orleans. The 86-acre site, with walking trails and boardwalks winding through a swampy forest, flooded in 2005 and became overrun with Chinese tallow in the years that followed.(AP Photo/Stacey Plaisance)