Syringa reticulata North America. Syringa reticulata Syringa reticulata (Japanese tree lilac; ; ) is a species of Lilac, native to eastern Asia: in northern Japan (mainly Hokkaidō), northern China (Gansu, Hebei, Heilongjiang, Henan, Jilin, Liaoning, Nei Mongol, Ningxia, Shaanxi, Shanxi, Sichuan), Korea, and far southeastern Russia (Primorye). "Syringa reticulata" is a deciduous small tree growing to a height of 39' (12 m), rarely to 49' (15 m), with a trunk up to 11.8" (30 cm), rarely 15.7" (40 cm) diameter; it is the largest species of lilac, and the only one that regularly makes a small tree rather than a shrub. The
Chicago Botanic Garden by John O. Simonds and Geoffrey Rausch. Several famous buildings have been designed by well-known architects since 1976. The Chicago Botanic Garden opened the Daniel F. and Ada L. Rice Plant Conservation Science Center, located at the south end of the garden, to the public on September 23, 2009. In September 2010, the Plant Science Center earned a GOLD LEED (Leadership in Energy and Environmental Design) rating from the U.S. Green Building Council because of its sustainable design. The Chicago Botanic Garden conserves rare plant species, and is working with regional, national and international organizations on behalf of plant conservation.