An evergreen, dioecious or occasionally monoecious tree capable of attaining great size and age. Branches not whorled, shoots angular, leaves scale-like in whorls of three. Female cones globose, to 1 cm across, of up to nine scales arranged in three alternating whorls, each scale bearing between two and six, two or three-winged seeds (Earle 2018).
A genus of a single extant species of conifer in the Cupressaceae, endemic to southern Chile and Argentina. It was named for Vice-Admiral Robert FitzRoy RN, who captained HMS Beagle, the ship that carried Charles Darwin on his voyage to the Galapagos. In the 1990s, fossilised foliage dating from the Oligocene (c. 35 million years ago) was discovered in Tasmania and described as a new species in the fossil record, demonstrating the Gondwanan origins of the genus.