Bosistoa floydii, commonly known as five-leaf bosistoa, is a species of rainforest tree native to eastern Australia. This member of the Rutaceae family, which also includes citrus, is recognized for its distinctive foliage and its role within its natural ecosystem. The genus Bosistoa is named in honor of the Australian botanist James Bosisto. The physical characteristics of Bosistoa floydii are key to its identification. It is typically a small to medium-sized tree, often reaching heights of 8 to 15 meters, though it can occasionally grow taller in optimal conditions. Its growth habit is generally upright with a spreading canopy. The most striking feature is its leaves, which are compound and typically consist of five leaflets, hence the common name. These leaflets are ovate to elliptic in shape, with smooth or finely toothed margins, and are arranged oppositely along the leaf stalk. The upper surface of the leaves is a glossy dark green, while the underside is paler. The bark of Bosistoa floydii is usually smooth and greyish, becoming slightly rougher with age. During the flowering season, the tree produces clusters of small, creamy-white flowers. These flowers are often fragrant and attract various pollinators. Following flowering, the plant develops small, woody capsules that contain seeds. Bosistoa floydii is found in the subtropical rainforests of New South Wales and Queensland, Australia. It prefers moist, well-drained soils and thrives in shaded to partially shaded environments, often growing as an understory tree in mature forests or along rainforest margins. While it is adapted to the humid conditions of its native habitat, it can be cultivated in similar climates, requiring protection from frost and consistent moisture. Ecologically, Bosistoa floydii plays a role in supporting local fauna. Its flowers provide nectar for insects, and its fruits may be consumed by birds. As a component of the rainforest understory, it contributes to the structural diversity of the habitat. There is no widespread agricultural, medicinal, or culinary use documented for this species. Its primary significance lies in its botanical interest and its contribution to the biodiversity of Australian rainforests. An interesting characteristic of Bosistoa floydii, shared with some other members of the Rutaceae family, is the presence of oil glands in its leaves and bark, which can give them a distinctive aromatic quality when crushed. This aromatic property is a common trait within the citrus family and is due to the volatile oils produced by these glands. The specific arrangement and number of leaflets, typically five, are reliable indicators for distinguishing this species from other rainforest trees.