It is organized into four major sections :
Today the arboretum contains more than 405 varieties of trees representing 88 species ; despite the arboretum 's difficult history , many mature specimens remain from the arboretum 's earliest planting .
arboretum is organized into four major sections :
Today the arboretum contains more than 405 varieties of trees representing 88 species ; despite the arboretum 's difficult history , many mature specimens remain from the arboretum 's earliest planting .