Billardiera, commonly known as appleberries or bluebell creepers, is a genus of about 23 species of flowering plants in the family Pittosporaceae, order Apiales. The genus is endemic to Australia, with species distributed across every mainland state and Tasmania.
Plants in the genus are woody scramblers, climbers, or undershrubs with twining branches that can reach several metres in length. The leaves are simple, elliptic, lance-shaped, or linear, arranged alternately along the stems. Flowers are borne singly or in cymes at the ends of branches and range in colour from greenish-yellow and cream to purple and blue. The five petals are considerably longer than the sepals and may be free from each other or joined at the base to form a tube with spreading lobes. The stamens are free but their anthers are sometimes joined at the tip, encircling the style. The fruit is a succulent or fleshy berry, variously shaped and containing many seeds — giving rise to the common name "appleberry."
The genus was first formally described in 1793 by the English botanist James Edward Smith in his work A Specimen of the Botany of New Holland. The type species is Billardiera scandens, the hairy appleberry. The genus name honours the French naturalist Jacques-Julien Houtou de Labillardière, who collected extensively in Australia and the Pacific. Well-known members include B. heterophylla (bluebell creeper), widely grown as an ornamental, B. longiflora (purple appleberry, Tasmania), and B. cymosa (sweet appleberry, South Australia and Victoria).
Etymology
The genus name Billardiera was given by the English botanist James Edward Smith in 1793 to honour the French botanist and explorer Jacques-Julien Houtou de Labillardière, who collected plants in Australia and the South Pacific during the late 18th century. The common names "appleberry" and "snot berry" refer to the fleshy, edible fruit produced by many species.
Distribution
Billardiera is endemic to Australia. Species are found across a wide range of states and territories: Western Australia holds the greatest diversity, with additional species recorded in South Australia, Queensland, New South Wales, the Australian Capital Territory, Victoria, and Tasmania.
Taxonomy Notes
The genus Billardiera was formally described in 1793 by James Edward Smith in A Specimen of the Botany of New Holland, making it one of the earliest Australian plant genera to be formally named. The type species is Billardiera scandens. The genus belongs to the family Pittosporaceae within the order Apiales. The Australian Plant Census recognises approximately 23 accepted species as of May 2023.
