Geniostoma petiolosum, commonly known as boar tree, is a flowering plant in the Loganiaceae family. The specific epithet refers to the relatively long and narrow petioles.[1]
It is a shrub or small tree, growing to 5 m in height. The lanceolate-elliptic leaves are 5.5–14 cm long and 2–4.5 cm wide. The inflorescences are clustered, 1–2 cm long, bearing 5–20 small flowers. The ovoid-globose capsules, 6–7 mm long, contain small, black seeds in yellow pulp.[1]
The plant is endemic to Australia's subtropical Lord Howe Island in the Tasman Sea. It is an uncommon inhabitant of sheltered forest throughout the Island, especially at lower elevations.[1]