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Chamaecyparis, common names cypress or false cypress (to distinguish it from related cypresses), is a genus of conifers in the cypress family Cupressaceae, native to eastern Asia (Japan and Taiwan) and to the western and eastern margins of the United States. The name is derived from the Greek khamai (χαμαί), meaning "on the earth", and kuparissos (κυπάρισσος) for "cypress".
They are medium-sized to large evergreen trees growing from 20–70 m (66–230 ft) tall, with foliage in flat sprays. The leaves are of two types, needle-like juvenile leaves on young seedlings up to a year old, and scale-like adult leaves. The cones are globose to oval, with 8-14 scales arranged in opposite decussate pairs; each scale bears 2-4 small seeds.
Chamaecyparis taiwanensis is treated by many authors as a variety of C. obtusa (as C. obtusa var. formosana).
Genus Fokienia is not always recognized as a separate genus from Chamaecyparis, in which case Chamaecyparis hodginsii (=Fokienia hodginsii) should be added to the above list. On the other hand, a species which used to be included in this genus, as Chamaecyparis nootkatensis, had been transferred on the basis of strong genetic and morphological evidence to the separate genus Xanthocyparis as Xanthocyparis nootkatensis in the early 2000s. After further phylogenetic work the species was moved to the monotypic genus Callitropsis nootkatensis, being sister to the genus Hesperocyparis, and both genera forming a clade with Xanthocyparis as its sister.
There are also several species described from the fossil record including:
Chamaecyparis species are used as food plants by the larva of some Lepidoptera species, including juniper pug and pine beauty.