Join gardener extraordinaire Robin Wilkerson for a day trip to the remarkable High Line in New York City on Wednesday, October 3.  The garden is built on a formerly abandoned mile and a half of elevated railroad line.  Both the hardscape and the plant material are informed by the structure’s history as a rail bed.  Native oaks, sassafras, sumacs, and an array of ornamental grasses are just a few of the plants rarely encountered in public gardens, but among many of the outstanding plant choices.  A High Line docent will lead this Friends of Wellesley Botanic Garden, Arnold Arboretum of Harvard University, and New England Wild Flower Society tour.  There will be time for lunch and exploration on your own.  Don’t miss this chance to see and experience what has quickly become one of the world’s great urban wonders.  Fee ($120 for members of the sponsoring organizations, $145 for non-members) includes private coach with restroom, snacks, box lunch and guided tour.  Bus departs Garden in the Woods, Framingham, at 7:30 a.  To register, visit www.wellesley.edu/wcbgfriends.