Gonocarpus tetragynus, commonly known as Common Raspwort, is a perennial herb native to Australia. This species is a member of the Haloragaceae family, a group of plants often found in aquatic or damp environments, though Gonocarpus tetragynus is typically found in terrestrial habitats. It plays a role in its native ecosystems, contributing to ground cover and providing habitat for small invertebrates. The plant exhibits an erect to spreading growth habit, typically reaching a height of 30 to 60 centimeters, though it can occasionally grow taller. Its stems are often somewhat woody at the base, becoming more herbaceous towards the apex. The leaves are arranged alternately along the stem and are generally ovate to lanceolate in shape, measuring between 2 to 7 centimeters in length and 1 to 3 centimeters in width. The leaf margins are usually toothed or serrated. The surface of the leaves can be slightly rough, contributing to the "rasp" in its common name. Flowering occurs from spring through summer, producing small, inconspicuous flowers. These flowers are typically greenish or yellowish and are borne in terminal or axillary spikes. Each flower has four sepals and four petals, though petals may be absent in some specimens. The fruit is a small, ovoid drupe, approximately 2 to 3 millimeters in diameter, which ripens to a reddish-brown color. The seeds are small and are dispersed by various means, including water and animals. Gonocarpus tetragynus is widely distributed across eastern Australia, found in New South Wales, Victoria, Queensland, and Tasmania. It thrives in a variety of habitats, commonly occurring in moist forests, woodlands, and along creek banks, often in sandy or loamy soils. While it prefers moist conditions, it can tolerate some degree of dryness once established. Cultivation requirements are generally straightforward; it prefers a position in partial shade to full sun and well-drained soil. It is a hardy plant that can adapt to a range of soil types, though it performs best in moist, fertile conditions. Historically, there are no widely documented ornamental, medicinal, culinary, or economic uses for Gonocarpus tetragynus. Its primary significance lies in its ecological role within its native Australian flora. It contributes to the biodiversity of its habitat and serves as a food source or shelter for local fauna. An interesting characteristic of this plant is its ability to colonize disturbed areas, acting as a pioneer species in some environments. The rough texture of its leaves, a defining feature, is thought to be an adaptation that may deter some herbivores.