Chamaecyparis is a genus of coniferous trees or shrubs that are commonly known as False Cypress. There are several synonyms for the word Chamaecyparis, including Retinispora, Xanthocyparis, and Callitropsis. Retinispora is often used as a synonym for certain species of Chamaecyparis, such as Chamaecyparis obtusa. Xanthocyparis is a relatively new name for some western North American species of Chamaecyparis, including Chamaecyparis lawsoniana. Callitropsis is a synonym for some species of Chamaecyparis found in western North America, including Chamaecyparis nootkatensis. Understanding the synonyms for Chamaecyparis can help make it easier to identify different species of False Cypress.