The botanical family tree has been dramatically rewritten in recent years, as DNA analysis has brought a refined understanding of how plants evolved from primitive forms.  Robin Hazard Ray and Jim Gorman will lead a botanical tour through Mount Auburn Cemetery on Tuesday, June 14, beginning at 5:30 pm, to demonstrate the cemetery’s diverse plant collection, victors of the struggle for survival over geologic time.  $5 for Friends of Mount Auburn, $10 for non-members.  To register, call 617-607-1952, or email Michelle Pizzillo at mpizzillo@mountauburn.org.  Photo by Alida Thorpe.