Hibbertia riparia, commonly known as Erect Guinea-flower, is a species of flowering plant in the family Dilleniaceae. This Australian native is recognized for its vibrant yellow flowers and its adaptability to various Australian landscapes. It is a valuable component of its native ecosystems and is also appreciated in horticulture for its ornamental qualities. The Erect Guinea-flower typically presents as a shrub, often erect in habit, though its form can vary. Mature plants generally reach heights between 0.5 to 2 meters, with a similar spread. The leaves are simple, alternate, and often lanceolate to ovate in shape, measuring approximately 2 to 7 centimeters in length and 0.5 to 2 centimeters in width. They are usually dark green on the upper surface and may be paler or have a slightly hairy underside. The most striking feature of Hibbertia riparia is its solitary, bright yellow flowers, which are typically 2 to 4 centimeters in diameter. These flowers possess five petals, which are often crinkled, and numerous stamens. Flowering usually occurs from late winter through spring, and sometimes into summer, depending on the region and specific environmental conditions. Following successful pollination, the plant produces a small, dehiscent capsule containing seeds. Hibbertia riparia is indigenous to eastern Australia, with its native range extending across New South Wales, Queensland, Victoria, and Tasmania. It thrives in a variety of habitats, often found in open woodlands, heathlands, and along creek banks, as its common name suggests. It prefers well-drained soils and can tolerate a range of conditions from full sun to partial shade. While it is adapted to its native climate, it generally performs best in temperate to subtropical regions. In cultivation, it is relatively hardy and drought-tolerant once established, making it a low-maintenance choice for gardens. It is well-suited to rockeries, borders, and as a specimen plant. The ecological role of Hibbertia riparia includes providing nectar and pollen for native insects, contributing to the biodiversity of its habitat. While not widely cultivated for specific economic purposes, its ornamental value is significant. Its bright, cheerful flowers bring color to gardens during its blooming period. There is no widespread documented use of this species for medicinal, culinary, or significant agricultural purposes. An interesting characteristic of Hibbertia riparia is its ability to regenerate from seed after disturbances such as fire, a common adaptation in Australian flora. The vivid yellow of its flowers is a characteristic feature of many species within the Hibbertia genus, often attracting pollinators with their bright display. The genus name, Hibbertia, honors the English botanist George Hibbert.