Jennifer Berlinger, creator of History of Existing Life artwork, will share how evolutionary history is changing traditional plant classifications, and how this will improve medicine, agriculture and conservation.  The presentation will take place at Tower Hill Botanic Garden, 11 French Drive in Boylston, on Sunday, April 17 at 1 pm.  Free with admission to the garden, but pre-registration is required, at www.towerhillbg.org.