Are both Nerium or Thuja could be a shrub?
Thuja Thuja ( ) is a genus of coniferous trees in the Cupressaceae (cypress family). There are five species in the genus, two native to North America and three native to eastern Asia. The genus is monophyletic and sister to "Thujopsis". Members are commonly known as arborvitaes, (from Latin for "tree of life") thujas or cedars.
Thuja sutchuenensis Thuja sutchuenensis (Sichuan thuja) is a species of thuja, an evergreen coniferous tree in the cypress family Cupressaceae. It is native to China, where it is an endangered local endemic in Chengkou County (Chongqing Municipality, formerly part of Sichuan province), on the southern slope of the Daba Mountains.