Elizabeth Farnsworth, Senior Research Ecologist with the New England Wildflower Society, will speak at the Hunnewell Building of the Arnold Arboretum on Tuesday, May 15, beginning at 6 pm, in a free presentation, although registration is requested at www.my.arboretum.harvard.edu. New England Wild Flower Society’s Go Botany web tool is a fun way to learn about plants in the city and beyond. Elizabeth Farnsworth will guide you through this innovative technology to learn how to identify ore than 1200 of the most common native and naturalized plant species in New England. Bring your laptop computer or tablet and start identifying our fabulous flora! Part of National Urban Biodiversity Week.