What is the difference between Chinese arborvitae leaf and cypress leaf? A glance at the leaf shape and twigs tells you

Many people lump the leaves of Cupressaceae plants together under the name "cypress leaf", but Chinese arborvitae leaf and cypress leaf are actually not entirely equivalent concepts. Chinese arborvitae leaf has a single source, referring specifically to the branches and leaves of Platycladus orientalis (Chinese arborvitae) in the genus Platycladus of the Cupressaceae; whereas cypress leaf is mostly a general term, and what people in different regions call cypress leaf may come from various Cupressaceae trees such as Chinese weeping cypress, Chinese juniper, and Chinese prickly cypress.

Morphologically, the difference between the two is fairly obvious. The leaves of Chinese arborvitae are all tiny and scale-like, closely pressed against the twigs and decussately opposite, with the twigs flat and upright, arranged in the same plane, which is also the origin of the name "Chinese arborvitae". The leaves of Chinese juniper, by contrast, come in two forms, scale-like and needle-like, with more needle-like leaves on young trees that feel prickly to the touch; the leaves of Chinese prickly cypress are all needle-like; and the twigs of Chinese weeping cypress are slender and slightly drooping, with glandular dots often visible on the underside of the leaves.

Their uses must also be distinguished. In traditional Chinese medicine, the source of Chinese arborvitae leaf is clearly defined: it is the dried branches and leaves of Platycladus orientalis, traditionally used for cooling the blood and stopping bleeding, and for premature graying of the hair and beard. But for cypress leaf as a general term, since the tree species of origin is unclear, its components and effects cannot be lumped together, so if you want to make tea, infuse liquor, or use it as medicine, you should make sure it is genuine Chinese arborvitae leaf.

For everyday identification, just remember two points: first, check whether the twigs are flat and whether all the leaves are tiny scales; second, check whether the leaf shape feels prickly. If you cannot tell the tree species apart, it is not advisable to collect the leaves yourself for medicinal use; it is best to buy from proper channels to avoid misuse.