Acronychia oblongifolia, commonly known as white aspen, is a small to medium sized rainforest tree of the Rutaceae (citrus) family endemic to eastern Australia, distributed from Queensland to Victoria. The true aspens of the northern hemisphere belong to the genus Populus in the family Salicaceae. A. oblongifolia has green foliage and white succulent fruit appearing over winter to late spring. The white aspen was first described by Allan Cunningham in 1834 as Cyminosma oblongifolia, before being reclassified as Acronychia oblongifolia by German botanist Gustav Heynhold in 1840. The specific name, from the Latin folium 'leaf', refers to the oblong shape of the leaves. Common names include Common Acronychia and Yellow Wood as well as white aspen. The trade name is Hard Aspen.