Parasitaxus
Parasitaxus usta, also known in French as cèdre rabougri, is a rare species of conifer of the family Podocarpaceae, and the sole species of the genus Parasitaxus.
Description
It is a woody shrub up to endemic to the remote, densely forested areas of New Caledonia, first discovered and described by Vieillard in 1861. The first definitive report that it was a parasite was in 1959.Taxonomy
Molecular phylogenetic analysis also suggest affinities between Parasitaxus and the genera Manoao and Lagarostrobos. Parasitaxus has been shown to contain high levels of chlorophyll. However, a genome analysis shows that many genes for photosynthesis are missing from the parasite's plastid genome, strongly suggesting that Parasitaxus completely depends on its host for survival. Around 60% of the genes normally present in a podocarp plastid genome were entirely absent or present only as fragments. They were predominantly genes involved in photosynthetic, rather than other plastid processes. There were changes to the structure of the plastid genome that were different from that of other parasitic plants and its podocarp relatives, although these might not be related to its parasitic lifestyle.Usta means 'parched'. The species was first described as Dacrydium ustum Vieill.; other synonyms include Podocarpus ustus Brongn. & Gris, and Nageia usta Kuntze. The name is often cited as Parasitaxus ustus, but this is grammatically incorrect, as, according to Latin, the genus name Parasitaxus is gender-feminine, with which the species name's gender must agree. The scientific name translates as "parched parasitic yew."