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Canadian wood-nettle (Laportea canadensis), photographed at Brooklyn Botanic Garden (New York) in September

Canadian wood-nettle (Laportea canadensis) | By Raffi Kojian (http://Gardenology.org) [CC BY-SA 3.0], via Wikimedia Commons

Canadian wood-nettle (Laportea canadensis), photographed at Brooklyn Botanic Garden (New York) in September

By Raffi Kojian (http://Gardenology.org) [CC BY-SA 3.0], via Wikimedia Commons