Claim: The Lawson cypress or Chamaecyparis lawsoniana of the Plantae kingdom is native in California and Oregon with many types and colors like the silver-blue Chilworth Silver and the yellow-green Golden Wonder.
Evidence: Chamaecyparis lawsoniana, known as Port Orford cedar or Lawson cypress, is a species of conifer in the genus Chamaecyparis, family Cupressaceae. Plantae Kingdom: It is native to Oregon and northwestern California, and grows from sea level up to 1,500 m (4,900 ft) in the valleys of the Klamath Mountains, often along streams. Several hundred named cultivars of varying crown shape, growth rates and foliage colour have been selected for planting in parks and gardens. In the UK the following have gained the Royal Horticultural Society's Award of Garden Merit (confirmed 2017): silver-blue 'Chilworth Silver' 'Golden Wonder' yellow-green