Syncarpia is a small group of trees in the myrtle family (Myrtaceae) described as a genus in 1839. They are native to Queensland and New South Wales in Australia. They are unusual among the Myrtaceae in that the leaves are opposite rather than alternate as is the norm for the family. The species are commonly known as turpentine trees due to the odour of their resin. S. glomulifera is considered a weed in Hawaii. formerly included now in Choricarpia Xanthostemon