Today the arboretum has grown to contain more than 370 taxa of woody plants, including major collections of Acer (130 taxa including 90 species and subspecies, with the remainder cultivars), Viburnum (27 taxa), Quercus (27), Cornus (23), Euonymus (15), Rhus (10), Tilia (9), and Liquidambar (4).
Poison Oak is part of the Sumac (Anacardiaceae)family, Toxicodendron diversilobum or Rhus diversiloba is the binomial name for Poison Oak in the Western United States and south to Mexico.
It feeds on seeds, (particularly those of proteas, Othonna amplericaules and Rhus anarcardia) and some fruit, nectar and shoots.
Rhus aromatica, the fragrant sumac, a plant species native to Canada and the United States
Rhus trilobata, the sourberry, skunkbush or three-leaf sumac, a shrub species native to the western half of Canada and the United States
The infestation by Chinese sumac aphids (Melaphis chinensis Bell) can lead to a gall which is valued as a commercial product.
Also in 2007, Tyson Mao, one of the best cube solvers in the world, taught SUMaC students how to solve the Rubik's Cube.